Mark the best option:
The maximum duration for which the Vice-President may officiate as the President of India is
The Vice President shall act as the President, in case of any vacancy in the office of the President by reason of his death, resignation, removal through impeachment or otherwise. The Vice President shall take over the duties of the President until a new President is elected and resumes office within six months of the occurrence of the vacancy.
6 months is the correct option.