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)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

they are available on magnetic tapes
they are partly in primary memory and partly on disk
they are memory resident
they are initially stored on disk
None of these

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