Operating System (OS)
The ability of an operating system to control the activities of multiple program at the same time is called

Multiprocessing
Multitasking
Multioperating
Multipaging

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

to provide for long and short term storage of files with appropriate economic tradeoffs.
None of these
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

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