Operating System (OS)
An incremental backup

None of these
uses more tapes
saves only files that have recently changed
should be done each month
saves all files

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

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

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