Operating System (OS)
File record length

depends upon the size of the file
Should always be variable
should always be fixed
None of these
should be chosen to match the data characteristics

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Operating System (OS)
Backups should be done

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

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Operating System (OS)
The Memory Address Register

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".
None of these
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.
contains the address of the memory location that is to be read from or stored into.

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