Operating System (OS)
Backups should be done

as several image copies, followed by an incremental
daily for most installations
as several incrementals, followed by an image copy
None of these
weekly for most installations

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Operating System (OS)
A public key encryption system

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

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