Operating System (OS)
Backups should be done

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

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Operating System (OS)
Addressing structure

All of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
defines the fundamental method of determining effective operand addresses

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