Correct Answer: (a) President of India
Solution:The President of India is the head of the Indian state, the first citizen, and acts as the symbol of unity, integrity and solidarity of the nation. According to Article 52, There shall be a President of India'. According to Article 53, the executive power of the Union Shall be vested in the President and shall be exercise by him either directly of through officers subordinate to him in accordance with this Constitution.