Operating System (OS)
A co-processor

Works with any application
Is relatively easy to support in software
Is quite common in modern computer
Causes all processor to function equally

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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
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

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