Operating System (OS)
A critical region is

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

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Operating System (OS)
The dispatcher

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

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