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 often causes unexpected system crashes
a program segment where shared resources are accessed
a program segment that has not been proved bug-free

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Operating System (OS)
The advantage(s) inherent to using high level languages is (are)

Improved debugging capability, and superior documentation
Fewer people, less management and shorter transition in learning time
None of these
A greater degree of machine independence
All of these

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