Operating System (OS)
Memory management is :

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

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Operating System (OS)
Thrashing can be avoided if

None of these
the speed of CPU is increased
the speed of I/O processor is increased
the pages, belonging to the working set of the programs, are in main memory
All of these

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