The correct answer is Option 4.

• To supervise the functioning of the State Public Service Commissions​ is not a statutory function of UPSC.

• The Union Public Service Commission commonly abbreviated as UPSC is India's premier central recruiting agency.
• It is responsible for appointments to and examinations for All India services and group A & group B of Central services.
• While the Department of Personnel and Training is the central personnel agency in India.
• Articles 315 to 323 of Part XIV of the constitution, titled as Services Under the Union and the States, provide for a Public Service Commission for the Union and for each state.
• Accordingly, as per Art. 315, at Union level, Union Public Service Commission is envisaged by it.
• UPSC is amongst the few institutions which function with both autonomy and freedom, along with the country’s higher judiciary and lately the Election Commission.
• As per Art. 316, the Chairman and other members of the Union Public Service Commission shall be appointed by the President.
• The agency's charter is granted by Part XIV of the Constitution of India, titled as Services Under the Union and the States.
• The commission is mandated by the Constitution for appointments to the services of the Union and All India Services.
• It is also required to be consulted by the Government in matters relating to the appointment, transfer, promotion, and disciplinary matters.
• The commission reports directly to the President and can advise the Government through him.
• Although, such advice is not binding on the Government.
• Being a constitutional authority, UPSC is amongst the few institutions which function with both autonomy and freedom, along with the country’s higher judiciary and lately the Election Commission.
• The commission is headquartered at Dholpur House, in New Delhi and functions through its own secretariat.
• Pradeep Kumar Joshi has been the Chairman of UPSC since August 2020.
• Established on 1 October 1926 as Public Service Commission, it was later reconstituted as Federal Public Service Commission by the Government of India Act 1935; only to be renamed as today's Union Public Service Commission after the independence.