Even if a trip from home to your office (or other principal place of business) has a specific business purposeâfor example, to meet with a client at your officeâit is still considered commuting and is not eligible for a mileage deductible if you start out from your home.
If /DEBUG is specified, the default for /OPT is NOREF, and all functions are preserved in the image. To override this default and optimize a debugging build, specify /OPT:REF. Because /OPT:REF implies /OPT:ICF, we recommend that you also specify /OPT:NOICF to preserve identical functions in debugging builds. This makes it easier to read stack traces and set breakpoints in functions that would otherwise be folded together. The /OPT:REF option disables incremental linking.
To be eligible for OPT you must: 1  Be registered full-time in a degree program for at least one academic year (three quarters) in valid F-1 status. 2  Have not used 12 months of OPT for a previous degree at the same level (e.g. you are doing an MBA and have already used your Master's level OPT after a previous MA/MS degree)