Operating System (OS)
A public key encryption system

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

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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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