Explanation:

Note: The question is asking for incorrect options.
•When president resigns VP intimate the same only to speaker
•Till new president is elected the previous president will remain in office
Article 56(1) of the Constitution provides that the President shall hold office for a term of five years from the date on which he enters upon his office. According to Article 62, an election to fill a vacancy caused by the expiration of the term of office of President shall be completed before the expiration of the term. An election to fill a vacancy in the office of President occurring by reason of his death, resignation or removal, or otherwise shall be held as soon as possible after, and in no case later than six months from, the date of occurrence of the vacancy; and the person elected to fill the vacancy shall, subject to the provisions of Article 56, be entitled to hold office for the full term of five years from the date on which he enters upon his office. To meet the contingency of an election to the office of President not being completed in time due to unforeseen circumstances like countermanding of election due to death of a candidate or on account of postponement of the poll for any valid reason, Article 56(1)(c) provides that the President shall, notwithstanding the expiration of his term, continue to hold office until his successor enters upon his office.