Operating System (OS)
A critical region is

none is the above
a program segment that often causes unexpected system crashes
a program segment that has not been proved bug-free
one which is enclosed by a pair of P and V operations on semaphores
a program segment where shared resources are accessed

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Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

None of these
suspending some of the processes when the CPU load is high
assigning ready process to the CPU
bring processes from the disk to the main memory
swapping a process to the disk

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