Operating System (OS)
Sleep is a good mode to use because

It saves power which in true is saving money
It makes computer fresh after it wakes up
All of the listed here
It consumes low battery when you start it again

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Operating System (OS)
Multiprogramming systems:

are easier to develop than single programming system
are used only on large mainframe computers
None of these
execute each job faster
execute more jobs in the same time period

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