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

branches off to the interrupt service routine immediately
None of these
hands over control of address bus and data bus to the interrupting device
halts for a predetermined time
branches off to the interrupt service routine after completion of the current instruction

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Operating System (OS)
The term "operating system" means

the way a floppy disk drive operates
the way a computer operator works
None of these
a set of programs which controls computer working
conversion of high level language into machine code

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