What is the significance of the term "unless he has elected otherwise" in this context according to this provision?
The significance of the term "unless he has elected otherwise" in this context is that it allows the Auditor-General of India holding office immediately before the commencement of the Constitution to choose not to become the Comptroller and Auditor-General of India upon the commencement of the Constitution. If they make this election, they would not be entitled to the salaries, rights in respect of leave of absence, and pension as provided under clause (3) of Article 148 for the Comptroller and Auditor-General of India.