Operating System (OS)
The Memory Address Register

is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains the address of the memory location that is to be read from or stored into.
None of these
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".
is a hardware memory device which denotes the location of the current instruction being executed.

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Operating System (OS)
The LRU algorithm

pages out the first page in a given area
pages out pages that have been least used recently
pages out pages that have not been used recently
None of these
pages out pages that have been used recently

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Operating System (OS)
Link encryption

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

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