The correct answer is option 1, The President. The President of India has the authority to call for a Joint Session of the two Houses of Parliament. A Joint Session is conducted when there is a disagreement between the Lok Sabha (Lower House) and Rajya Sabha (Upper House) on a certain matter or when the President wants to address both Houses together. The President is the constitutional head of the country and has the power to exercise certain functions related to the functioning of the Parliament. Calling for a Joint Session is one of these powers. The Prime Minister, option 2, is the head of the government and not responsible for convening a Joint Session. The Lok Sabha Speaker, option 3, is responsible for maintaining order in the Lower House and the Vice-President, option 4, is the ex-officio Chairman of the Rajya Sabha.