Operating System (OS)
The dispatcher

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

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

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