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

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

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Operating System (OS)
The advantage(s) inherent to using high level languages is (are)

All of these
Fewer people, less management and shorter transition in learning time
Improved debugging capability, and superior documentation
A greater degree of machine independence
None of these

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