Operating System (OS)
....... is the layer of a computer system between the hardware and the user program

None of these
System environment
Operating system
Operating environment

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

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

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