Operating System (OS)
Memory management is :

not used on multiprogramming systems
None of these
replaced with virtual memory on current systems
critical for even the simplest operating systems
not used in modern operating system

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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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