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

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

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Operating System (OS)
Daisy chain is a device for

connecting a number of devices to a controller
connecting a number of controllers to a device
All of these
interconnecting a number of devices to a number of controllers
None of these

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