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

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

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Operating System (OS)
A critical region is

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

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