单选题：Which of the following instructions should not be privileged?

Which of the following instructions should not be privileged? @[B](1)
A. Turn off interrupts.
B. Read the clock.
C. Clear memory.
D. Modify entries in device-status table





A.Turn off interrupts.
B.Read the clock.
C.Clear memory.
D.Modify entries in device-status table


答案：B