Operating System (OS)
A critical region is

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

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Operating System (OS)
Feed back queue

dispatch tasks according to execution characteristics
are very easy to implement
are used to favor real-time tasks
require manual intervention to implement properly
None of these

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