Read the following passage and questions, then choose the right answer from options, the answer should be one of A, B, C, D.

<passage>:
Green OA mandates don’t assure OA to the entire research output of a university or funding agency, for the same reason that they don’t require OA without qualification. But implementing them provides OA to a much larger percentage of the research output than was already headed toward OA journals or OA repositories, and does so while leaving authors free to submit their work to the journals of their choice. Authors control the volume and growth of OA. They decide whether to submit their work to OA journals (gold OA), whether to deposit their work in OA repositories (green OA), and how to use their copyrights. But scholarly authors are still largely unfamiliar with their OA options. It’s pointless to appeal to them as a bloc because they don’t act as a bloc. It’s not hard to persuade or even excite them once we catch their attention, but because they are so anarchical, overworked, and preoccupied, it’s hard to catch their attention. The strongest OA policies use words like “must” or “shall” and require or seem to require OA. They’re commonly called OA “mandates.” But all three varieties of university “mandate” above show why the term is misleading. Loophole mandates don’t require OA without qualification: when publishers dissent, articles are either not deposited in the repository or not made OA. Deposit mandates don’t require OA without qualification: when publishers dissent, articles are deposited in a repository but are not made OA. Rights-retention mandates with waiver options don’t require OA without qualification: authors may obtain waivers and sometimes do. I haven’t seen a university OA “mandate” anywhere without at least one of these three kinds of flexibility. Second, as I’ve frequently argued, successful policies are implemented through expectations, education, incentives, and assistance, not coercion. Third, even the strongest policies—even the no-loophole, no-deference, no-waiver policies at the Wellcome Trust and NIH—make OA a condition on a voluntary contract. No policy anywhere pretends to impose an unconditional OA requirement, and it’s hard to imagine how any policy could even try. (“You must make your work OA even if you don’t work for us or use our funds”?) By contrast, we do have a good word for policies that use mandatory language for those who agree to be bound. We call them “contracts.” While “contract” is short, accurate, and unfrightening, it puts the accent on the author’s consent to be bound. That’s often illuminating, but just as often we want to put the accent on the content’s destiny to become OA. For that purpose, “mandate” has become the term of art, for better or worse. I use “mandate” with reluctance because it can frighten some of the people I’m trying to persuade and can give rise to misunderstandings about the policies behind the label. When we have time and space for longer phrases, we can talk about “putting an OA condition” on research grants, in the case of NIH-style policies, or “shifting the default to OA” for faculty research, in the case of Harvard-style policies. These longer expressions are more accurate and less frightening. However, sometimes we need a shorthand term, and we need a term that draws an appropriately sharp contrast with policies that merely request or encourage OA. Finally, a common misunderstanding deliberately promulgated by some publishers is that OA must be “mandated” because faculty don’t want it. This position gets understandable but regrettable mileage from the word “mandate.” It also overlooks decisive counter-evidence that we’ve had in hand since 2004. Alma Swan’s empirical studies of researcher attitudes show that an overwhelming majority of researchers would “willingly” comply with a mandatory OA policy from their funder or employer. all OA mandates are green. Unfortunately, however, many people mistakenly believe that all OA is gold OA and therefore mistake proposed green OA mandates for proposed gold OA mandates and raise objections that would only apply to gold OA mandates. But as more academics understand the green/gold distinction, and understand that well-written green OA mandates are compatible with academic freedom, more institutions are adopting green OA mandates, almost always at the initiative of faculty themselves. Finally, the fact that faculty vote unanimously for strong OA policies is a good reason to keep looking for a better word than “mandate.” At least it’s a good reason to look past the colloquial implications of the term to the policies themselves and the players who drafted and adopted them. Since 2008, most OA “mandates” at universities have been self-imposed by faculty. Deposit mandates generally depend on publisher permission for OA, just like loophole mandates. The difference is that they require deposit even when they can’t obtain permission for OA. Rights-retention mandates These require deposit in an OA repository as soon as the article is accepted for publication, just like deposit mandates. But they add a method to secure permission for making the deposit OA. There’s more than one way to secure that permission. At the Wellcome Trust and NIH, which pioneered this approach for funding agencies, when grantees publish articles based on their funded research they must retain the nonexclusive right to authorize OA through a repository. At Harvard, which pioneered this approach for universities, faculty members vote to give the university a standing nonexclusive right (among other nonexclusive rights) to make their future work OA through the institutional repository. When faculty publish articles after that, the university already has the needed permission, and faculty needn’t take any special steps to retain rights or negotiate with publishers. Nor need they wait for the publisher’s embargo to run. Harvard-style policies also give faculty a waiver option, allowing them to opt out of the grant of permission to the university, though not out of the deposit requirement. When faculty members obtain waivers for given works, then Harvard-style mandates operate like deposit mandates and the works remain dark deposits until the institution has permission to make them OA. First note that none of the three “mandates” absolutely requires OA. Loophole mandates allow some work to escape through the loophole. Deposit mandates allow some deposited work to remain dark (non-OA), by following publisher preferences. Rights-retention mandates with waiver options allow some work to remain dark, by following author preferences. Loophole policies and rights-retention policies both offer opt-outs. But loophole policies give the opt-out to publishers and rights-retention policies give it to authors. The difference is significant because many more authors than publishers want OA for research articles. Many institutions adopt loophole policies because they believe a blanket exemption for dissenting publishers is the only way to avoid copyright problems. But that is not true. Deposit policies don’t make works OA until publishers allow OA, and rights-retention policies close the loophole and obtain permission directly from authors at a time when authors are the copyright holders. There are two reasons why these strong funder policies don’t infringe faculty freedom to submit work to their journals of their choice. First, researchers needn’t seek funds from these funders. When they choose to do so, then they agree to the OA provisions, just as they agree to the other terms and conditions of the grant. The OA “mandate” is a condition on a voluntary contract, not an unconditional requirement. It’s a reasonable condition as well, since public funders, like the NIH, disburse public money in the public interest, and private funders, like the Wellcome Trust, disburse charitable money for charitable purposes. To my knowledge, no researchers have refused to apply for Wellcome or NIH funds because of the OA condition, even when they plan to publish in OA-averse journals. The OA condition benefits authors and has not been a deal-breaker.

<question>:
Which of the OA mandates gives the author the most control over their work?

<options>:
A Libre green mandates
B Loophole mandates
C Deposit mandates
D Rights-retention mandates

<answer>:

D