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

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

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Operating System (OS)
Feed back queue

dispatch tasks according to execution characteristics
are very easy to implement
require manual intervention to implement properly
are used to favor real-time tasks
None of these

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