Operating System (OS)
The function(s) of file system is (are):

to provide security against loss of information due to system failure
to provide for long and short term storage of files with appropriate economic tradeoffs.
to provide complete file naming freedom to the users and to permit controlled sharing of files
None of these
All of these

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

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