Operating System (OS)
You should choose sleep option when

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
You finish working and going to bed

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Operating System (OS)
The Memory Address Register

is a hardware memory device which denotes the location of the current instruction being executed.
None of these
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".
contains the address of the memory location that is to be read from or stored into.

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