Operating System (OS)
File record length

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

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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
branches off to the interrupt service routine after completion of the current instruction
None of these
halts for a predetermined time

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