The correct answer is option 1, Vice-President. When the President of a country decides to resign from their position, they address their resignation letter to the Vice-President. The Vice-President is the second highest-ranking official in the executive branch and serves as the successor to the President in case of resignation, death, or removal from office. By addressing the resignation letter to the Vice-President, the President follows the proper protocol and ensures a smooth transition of power. It is important to note that the Prime Minister, option 2, is the head of the government and not involved in the resignation process of the President. The Speaker, Lok Sabha, option 3, and the Chief Justice of the Supreme Court, option 4, also do not play a role in the President`s resignation.