Operating System (OS)
Backups should be done

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

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Operating System (OS)
The dispatcher

never changes task priorities
None of these
is always small and simple
puts tasks in I/O wait
actually schedules the tasks into the processor

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Operating System (OS)
File record length

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

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