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

None of these
halts for a predetermined time
hands over control of address bus and data bus to the interrupting device
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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Operating System (OS)
Multiprogramming systems:

None of these
are used only on large mainframe computers
are easier to develop than single programming system
execute each job faster
execute more jobs in the same time period

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