Are the following four statements equivalent?

What clause can be placed after the UNION keyword to indicate that you want the UNION performed by comparing columns that have the same name in each result set?

a. WHERE b. GROUP BY c. HAVING d. CORRESPONDING

A __________ is an individual who seizes supervisory control of the system and uses this control to evade auditing and access controls or to suppress audit collection.

A) misfeasor B) clandestine user C) superuser D) masquerader