Operating System (OS)
A co-processor

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

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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
branches off to the interrupt service routine after completion of the current instruction
branches off to the interrupt service routine immediately
halts for a predetermined time

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