Operating System (OS)
A critical region is

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
one which is enclosed by a pair of P and V operations on semaphores

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Operating System (OS)
Swapping

None of these
works best with many small partitions
allows many programs to use memory simultaneously
allows each program in turn to use the memory
does not work with overlaying

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