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

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

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Operating System (OS)
Multiprogramming systems:

execute each job faster
are easier to develop than single programming system
are used only on large mainframe computers
None of these
execute more jobs in the same time period

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