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

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

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Operating System (OS)
You should choose sleep option when

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

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