Operating System (OS)
What do you mean by Memory Compaction?

Divide big memory hole into small holes
Combine multiple equal memory holes into one big hole
Divide memory hole by 2
Combine multiple small memory holes into one big hole

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Operating System (OS)
Memory management is :

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

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