Operating System (OS)
A critical region is

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 that often causes unexpected system crashes
none is the above
a program segment where shared resources are accessed

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Operating System (OS)
The LRU algorithm

None of these
pages out pages that have not been used recently
pages out the first page in a given area
pages out pages that have been least used recently
pages out pages that have been used recently

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