Periodically reviewing controls to verify that they still function as intended, upgrading controls when new requirements are discovered, ensuring that changes to systems do not adversely affect the controls, and ensuring new threats or vulnerabilities have not become known are all tasks.

Quick using the information in the graph, one might speculate that a) w. w.i created increased job opportunities in the u. s. b) the election of president hoover in 1936 caused unemployment to decline. c) the return of soldiers following w. w.ii caused unemployment to increase in the u. s. d) the new deal programs of president roosevelt created employment opportunities in the u. s.