The correct answer is option 1: President of India. The Union Public Service Commission (UPSC) is responsible for recruiting candidates for various central government positions in India. The members and chairman of UPSC are appointed by the President of India. The President has the authority to appoint and remove members of UPSC based on the recommendations made by the Union government. The selection of UPSC members by the President ensures the independence and neutrality of the commission, as it is not directly controlled by the government or any other authority. The appointment of UPSC members by the President also ensures that the commission operates in accordance with the principles of the Constitution of India.