Consider the following statement regarding the appointment of ad hoc Judge of the Supreme Court. Which of the following is/are correct?

A. Ad hoc Judge is to be appointed if the quorum of the Supreme Court judges is insufficient to hold or continue any session of the Court.

B. Chief Justice of India is required to consult the Chief Justice of the concerned High Court before appointing a Judge of the said High Court as Ad hoc Judge of the Supreme Court.

C. For appointment of ad hoc Judge, prior consent of the President is not mandatory.

D. Ad hoc Judge of the Supreme Court while attending the sittings of the Supreme Court enjoys all powers and privileges of a Supreme Court Judge.