When using semaphores, a process invokes the wait$()$ operation before accessing its critical section, followed by the signal$()$ operation upon completion of its critical section. Consider reversing the order of these two operations$$first calling signal$(),$ then calling wait$().$ What would be a possible outcome of this?

Select one:

a$.$

Starvation is possible.

b$.$

Several processes could be active in their critical sections at the same time.

c$.$

Mutual exclusion is still assured.

d$.$

Deadlock is possible.

c$.$

Reading and writing to ordinary pipes on both UNIX and Windows systems can be performed like ordinary file I$/$O$.$

d$.$

Named pipes can only be used by communicating processes on the same machine.