On receiving an interrupt from an I/O device the CPU:

branches off to the interrupt service routine immediately.

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halts for predetermined time.

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hands over control of address bus and data bus to the interrupting device.

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branches off to the interrupt service routine after completion of the current instruction.

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Solution

The correct option is D branches off to the interrupt service routine after completion of the current instruction.
After getting the interrupt CPU first executes current instruction then services the interrupt.

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