Operating System (OS)
Addressing structure

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

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Operating System (OS)
Backups should be done

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

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