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

All of these
to provide complete file naming freedom to the users and to permit controlled sharing of files
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.
None of these

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Operating System (OS)
The term "operating system" means

a set of programs which controls computer working
the way a computer operator works
the way a floppy disk drive operates
conversion of high level language into machine code
None of these

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