Operating System (OS)
Memory management is :

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

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Operating System (OS)
All of the following are task performed by the operating system except

Provides an interface for user to interact with computer
Managing hardware on the computer
Performing housekeeping task like file compression and disk defragmentation
Controlling the access that application program has to the CPU

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