The correct answer is option 4: Any number of times.

According to the Constitution of India, there is no limit on the number of times the President of India can seek re-election to his post. The President is elected by an Electoral College comprising of elected members of both houses of parliament, as well as the elected members of the Legislative Assemblies of the states.

It is important to note that, while there is no limit on the number of terms a President can serve, in practice, most Presidents in India have not sought re-election after their first term. However, the constitution allows for the possibility of a President being re-elected multiple times if they are chosen again by the Electoral College.