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

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Operating System (OS)
Data encryption

cannot be used by private installations
is mostly used by public networks
is mostly used by financial networks
None of these
is not necessary, since data cannot be intercepted

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