Operating System (OS)
Scheduling is

the same regard-less of the purpose of the system
not required in uniprocessor systems
allowing jobs to use the processor
None of these
unrelated to performance consideration

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Operating System (OS)
A critical region is

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

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