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)
Under virtual storage,

two or more programs are stored concurrently in primary storage
None of these
a single program is processed by two or more CPUs
only the active pages of a program are stored in primary storage
interprogram interference may occur

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