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

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

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Operating System (OS)
Scheduling is

not required in uniprocessor systems
the same regard-less of the purpose of the system
None of these
allowing jobs to use the processor
unrelated to performance consideration

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