Operating System (OS)
Semaphores

are used to do I/O
are used for memory management
synchronize critical resources to prevent contention
synchronize critical resources to prevent deadlock
None of these

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

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

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