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

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

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Operating System (OS)
Round-robin scheduling

allows processor-bound tasks more time in the processor
allows interactive tasks quicker access to the processor
None of these
gives each task the same chance at the processor
is quite complex to implement

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