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

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

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Operating System (OS)
File record length

Should always be variable
should always be fixed
depends upon the size of the file
should be chosen to match the data characteristics
None of these

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