Operating System (OS)
The memory allocation scheme subject to "external" fragmentation is

swapping
multiple contiguous fixed partitions
None of these
segmentation
pure demand paging

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Operating System (OS)
The dispatcher

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

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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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