With Regard to Cabinet Departments and the President

With regard to cabinet departments and the president,

A) presidents theoretically have considerable control over the cabinet departments.
B) presidents are able to appoint or fire all of the top officials.
C) cabinet departments do not always respond to the president's wishes.
D) below the top political levels, cabinet departments are staffed by permanent employees-many who resist change.
E) All of the above are true.