As Control Involves Both Mechanistic and Human Elements,it Is One

Multiple Choice

As control involves both mechanistic and human elements,it is one of the manager's most difficult tasks.Which of the following is the best answer about desirable characteristics of control systems?

A) Should be as simple as possible to operate and maintain
B) Should signal managers if they go out of order
C) Should be focused and admit the least amount of variation
D) Both A and B