The correct answer is (c). Only a retired Chief Justice of India can be the Chairman of the National Human Rights Commission (NHRC).
The NHRC is a statutory body established by the Parliament of India on 28 January 1993 under the Protection of Human Rights Act, 1993. It is an independent body that is mandated to protect and promote human rights in India. The NHRC has the power to inquire into any matter relating to the violation of human rights in India. It can also recommend appropriate measures to the government for the prevention of such violations.
The Chairman of the NHRC is appointed by the President of India on the recommendation of a selection committee consisting of the Prime Minister, the Chief Justice of India, and the Speaker of the Lok Sabha. The Chairman of the NHRC must be a person who has held the office of Chief Justice of India or who has been a judge of the Supreme Court for at least five years.
The other options are incorrect because they do not meet the eligibility criteria for the post of Chairman of the NHRC. A serving judge of the Supreme Court or a serving judge of a High Court cannot be appointed as the Chairman of the NHRC.