4. For each of the following departments in the cabinet of a U.S. president, give a brief description of its role.
(a) Department of State
(b) Department of the Treasury
(c) Department of Defense (formerly the War Department)
(d) Department of Justice
(e) Department of the Interior
(f) Department of Agriculture
(g) Department of Transportation
(h) Department of Energy
(i) Department of Education
(j) Department of Homeland Security