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

None of these
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
branches off to the interrupt service routine after completion of the current instruction

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Operating System (OS)
Feed back queue

are very easy to implement
None of these
are used to favor real-time tasks
dispatch tasks according to execution characteristics
require manual intervention to implement properly

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