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

branches off to the interrupt service routine after completion of the current instruction
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

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Operating System (OS)
Addressing structure

defines the fundamental method of determining effective operand addresses
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
All of these
None of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.

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