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

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

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Operating System (OS)
A critical region is

a program segment that has not been proved bug-free
a program segment that often causes unexpected system crashes
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

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