单选题：What happens when a process must wait on a semaphore?

What happens when a process must wait on a semaphore?@[C](1)
A. The process is preempted and sent to the ready queue
B. The process runs in a loop waiting for a signal
C. The process is blocked and sent to the waiting queue
D. The process terminates its operation





A.The process is preempted and sent to the ready queue
B.The process runs in a loop waiting for a signal
C.The process is blocked and sent to the waiting queue
D.The process terminates its operation


答案：C