Which of the Followings Is Not a Current Duty of the Board

Which of the followings is not a current duty of the Board of Governors of the Federal Reserve System?

A) Setting margin requirements, the fraction of the purchase price of the securities that has to be paid for with cash.
B) Setting the maximum interest rates payable on certain types of time deposits under Regulation Q.
C) Approving the discount rate "established" by the Federal Reserve banks.
D) Representing the United States in negotiations with foreign governments on economic matters.