Operating System (OS)
A critical region is

one which is enclosed by a pair of P and V operations on semaphores
a program segment that has not been proved bug-free
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)
System generation:

None of these
is always very difficult
varies in difficulty between systems
is always quite simple
requires extensive tools to be understandable

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