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

None of these
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
halts for a predetermined time

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Operating System (OS)
A co-processor

Causes all processor to function equally
Is quite common in modern computer
Works with any application
Is relatively easy to support in software

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