Operating System (OS)
Link encryption

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

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Operating System (OS)
Memory management is :

not used in modern operating system
not used on multiprogramming systems
critical for even the simplest operating systems
None of these
replaced with virtual memory on current systems

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