Operating System (OS)
A critical region is

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

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Operating System (OS)
A page fault

is an access to a page not currently in memory
occurs when a program accesses a page of memory
is an error is a specific page
is a reference to a page belonging to another program
None of these

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