Operating System (OS)
In which addressing mode the contents of a register specified in the instruction are first decremented, and then these contents are used as the effective address of the operands?

indirect addressing
None of these
auto decrement
index addressing
auto increment

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Operating System (OS)
Backups should be done

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

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