What is the significance of the term "unless he has elected otherwise" in this context according to this provision?
The term "unless he has elected otherwise" in this context implies that the Auditor-General of India holding office immediately before the commencement of the Constitution can choose to not become the Comptroller and Auditor-General of India upon the commencement of the Constitution. This option allows the individual to decide whether they wish to continue their service under the new title and terms provided by the Constitution or to opt out and pursue other opportunities.