Operating System (OS)
Feed back queue

are used to favor real-time tasks
None of these
dispatch tasks according to execution characteristics
require manual intervention to implement properly
are very easy to implement

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Operating System (OS)
You should choose sleep option when

You finish working and going to bed
You are leaving for a very short time and want to resume you work shortly
When computer gets hanged frequently. Let it sleep for some time
The computer is tired after working for the whole day

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