The correct answer is option 4, the President of India. The President of India holds the supreme command of the Indian Defence Forces. This means that the President is the highest-ranking authority in the military and is responsible for making decisions related to the defense and security of the country. The President exercises this command in accordance with the advice of the Council of Ministers, headed by the Prime Minister of India. While the Prime Minister and the Defence Minister play important roles in formulating defense policies and strategies, the ultimate authority lies with the President. It is important to note that the President`s role is largely ceremonial, and the day-to-day functioning of the defense forces is carried out by the Ministry of Defence, headed by the Defence Minister.