Operating System (OS)
Backups should be done

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

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Operating System (OS)
Round-robin scheduling

allows processor-bound tasks more time in the processor
is quite complex to implement
None of these
gives each task the same chance at the processor
allows interactive tasks quicker access to the processor

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Operating System (OS)
Memory management is :

not used on multiprogramming systems
not used in modern operating system
replaced with virtual memory on current systems
critical for even the simplest operating systems
None of these

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