Which of the following statements about semaphores is false?
a) A thread performs the P operation after it enters its critical section.
b) A thread performs the V operation before exiting its critical section.
c) Initializing a semaphore sets the value of a protected variable to indicate that no thread is executing its critical section.
d) Initializing a semaphore creates a queue that stores references to threads waiting to enter their critical sections protected by that semaphore.
a) A thread performs the P operation after it enters its critical section.
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