Which of the following is not an aggregate function that can be applied in a total row?

?Which of the following is a typical example of a system requirement for the control category?

A. ?The customer analysis system must produce a quarterly report that identifies changes in ordering patterns. B. ?The system must maintain separate levels of security for users and the system administrator. C. ?The data entry screens must be uniform, except for background color, which can be changed by the user. D. ?The warehouse distribution system must analyze daily orders and create a routing pattern for delivery trucks.

A ____ multiplexes 24 input channels together onto one high-speed telephone line.?

A. ?T-1 system B. ?SONET system C. ?SDH system D. ?congruent system