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

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

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Operating System (OS)
Scheduling is

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

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