The correct answer is “The President, after the enquiry conducted by the Supreme Court”.
Article 317 of Part XIV of the Constitution deals with the removal and suspension of members of a Public Service Commission, including the Chairman.
It states that the President can remove the Chairman or any member of a Public Service Commission, but only for misbehavior.
However, before removal, the Supreme Court must conduct an inquiry (based on procedures under Article 145) and report to the President that the person should be removed on these grounds.
Note: Under Part XIV of the Indian Constitution. The Chairman and members of the State Public Service Commission are appointed by the Governor of the State.