Operating System (OS)
Backups should be done

daily for most installations
None of these
as several image copies, followed by an incremental
weekly for most installations
as several incrementals, followed by an image copy

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Operating System (OS)
The Memory Address Register

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".
contains the address of the memory location that is to be read from or stored into.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
is a hardware memory device which denotes the location of the current instruction being executed.

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