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
halts for a predetermined time
branches off to the interrupt service routine immediately

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Operating System (OS)
The dispatcher

None of these
never changes task priorities
puts tasks in I/O wait
actually schedules the tasks into the processor
is always small and simple

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Operating System (OS)
A co-processor

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

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