Operating System (OS)
You should choose sleep option when

The computer is tired after working for the whole day
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
You finish working and going to bed

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Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

bring processes from the disk to the main memory
swapping a process to the disk
suspending some of the processes when the CPU load is high
None of these
assigning ready process to the CPU

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