If a thread attempts a P operation when a counting semaphore has been decremented to zero, ________.
a) the thread obtains a resource from the pool and decrements the semaphore to -1
b) the thread obtains a resource from the pool and the semaphore remains equal to 0
c) the thread must wait until a resource is returned to the pool by a V operation
d) the thread returns a resource to the pool and increments the semaphore to 1
c) the thread must wait until a resource is returned to the pool by a V operation
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Fill in the blank(s) with the appropriate word(s).