Which of the Following Is True of Executive Privilege

Which of the following is true of executive privilege?

A) It involves the ability of the president and executive branch officials to withhold certain information from Congress and the courts.
B) It means that members of the executive branch cannot be prosecuted for official acts.
C) It has been applied to the president's use of the pocket veto.
D) It allows the president discretion in making political appointments.
E) It was ruled unconstitutional by the U.S. Supreme Court in 1974.