Operating System (OS)
Memory

is a device that performs a sequence of operations specified by instructions in memory.
None of these
is a sequence of instructions
is typically characterized by interactive processing and time-slicing of the CPU
is the device where information is stored

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Operating System (OS)
You should choose sleep option when

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

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