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

None of these
halts for a predetermined time
branches off to the interrupt service routine immediately
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

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Operating System (OS)
System generation:

requires extensive tools to be understandable
varies in difficulty between systems
is always very difficult
is always quite simple
None of these

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