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

None of these
branches off to the interrupt service routine after completion of the current instruction
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)
The Register - to - Register (RR) instructions

All of these
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, except in the case of store operation when it is also
which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
have both their operands in the main store.

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