Which of the Following Is NOT True

Multiple Choice

Which of the following is NOT true?

A) Since semaphore and mutex lock are tools for synchronization, process that have used semaphores or mutex locks should not cause deadlocks
B) Semaphores and mutex locks may be shared resources that difference processes contend for, and hence deadlocks may occur
C) a set of processes is in a deadlocked state when every process in the set is waiting for an event that can be caused only by another process in the set
D) all of the above