Operating System (OS)
Block caches or buffer caches are used

to increase the capacity of the main memory
to handle interrupts
None of these
to improve disk performance
to speed up main memory read operation

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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
none is the above
a program segment that has not been proved bug-free
a program segment that often causes unexpected system crashes
a program segment where shared resources are accessed

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