Operating System (OS)
Link encryption

None of these
is less secure than end-to-end encryption
can not be used in a public network
is used only to debug
is more secure than end-to-end encryption

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Operating System (OS)
A public key encryption system

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

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