Operating System (OS)
Data encryption

is not necessary, since data cannot be intercepted
is mostly used by financial networks
None of these
cannot be used by private installations
is mostly used by public networks

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Operating System (OS)
A public key encryption system

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

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