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

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

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Operating System (OS)
Capacity planning

does not depend on the monitoring tools available
requires detailed system performance information
is independent of the operating system
None of these
is not needed in small installations

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