Operating System (OS)
Link encryption

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

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Operating System (OS)
Trojan-Horse programs

do not usually work
are hidden programs that do not show up on the system
usually are immediately discovered
None of these
are legitimate programs that allow unauthorized access

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