Operating System (OS)
A critical region is

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

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Operating System (OS)
The CPU, after receiving an interrupt from an I/O device

hands over control of address bus and data bus to the interrupting device
branches off to the interrupt service routine immediately
halts for a predetermined time
None of these
branches off to the interrupt service routine after completion of the current instruction

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