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

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Operating System (OS)
The function(s) of file system is (are):

to provide complete file naming freedom to the users and to permit controlled sharing of files
to provide security against loss of information due to system failure
to provide for long and short term storage of files with appropriate economic tradeoffs.
None of these
All of these

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