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
to provide complete file naming freedom to the users and to permit controlled sharing of files
All of these
to provide security against loss of information due to system failure

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Operating System (OS)
A public key encryption system

allows only the correct sender to decode the data
None of these
allows anyone to decode the transmission
allows only the correct receiver to decode the data
does not encode the data before transmitting it

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Operating System (OS)
Feed back queue

require manual intervention to implement properly
are very easy to implement
None of these
dispatch tasks according to execution characteristics
are used to favor real-time tasks

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