Operating System (OS)
Thrashing

always occurs on large computers
None of these
can always be avoided by swapping
can be caused by poor paging algorithms
is a natural consequence of virtual memory systems

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Operating System (OS)
A critical region is

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

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