The correct option is A President
The President of India is the first citizen of India, and he/she is the Supreme Commander of the defence forces. The President of India represents the entire country. This is why he is elected by the Electoral College, a body consisting of elected members of the Union Parliament and State Legislative Assemblies. The President has a fixed tenure of 5 years. The President has been given the responsibility of appointing the Chief of each arm of defence. All wars and declarations of peace are proclaimed in his name.