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
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

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Operating System (OS)
Link encryption

is used only to debug
is more secure than end-to-end encryption
can not be used in a public network
is less secure than end-to-end encryption
None of these

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