Void Presidential election, postponed elections, and Bill assent timelines

1. Consider the following statements. 1. If the election of the President of India is declared void by the Supreme Court of India, all acts done by him/her in the performance of duties of his/her office of President before the date of decision become invalid. 2. Election for the post of the President of India can be postponed on the ground that some Legislative Assemblies have been dissolved and elections are yet to take place. 3. When a Bill is presented to the President of India, the Constitution prescribes time limits within which he/she has to declare his/her assent. How many of the above statements are correct? [UPSC CSP 2023, GS Paper I]