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

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

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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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