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

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

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Operating System (OS)
Data encryption

is mostly used by public networks
None of these
is mostly used by financial networks
cannot be used by private installations
is not necessary, since data cannot be intercepted

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