Operating System (OS)
A critical region is

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

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Operating System (OS)
The dispatcher

None of these
never changes task priorities
is always small and simple
actually schedules the tasks into the processor
puts tasks in I/O wait

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