Operating System (OS)
The necessary conditions needed before deadlock can occur?

Mutual Exclusion, Hold and wait, Preemption, No Circular Wait
Mutual Exclusion, No Hold and wait, Preemption, Circular Wait
No Mutual Exclusion, Hold and wait, Preemption, Circular Wait
Mutual Exclusion, Hold and wait, No Preemption, Circular Wait

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Operating System (OS)
You should choose sleep option when

You finish working and going to bed
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

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