Operating System (OS)
The term "operating system" means

the way a floppy disk drive operates
a set of programs which controls computer working
None of these
the way a computer operator works
conversion of high level language into machine code

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Operating System (OS)
Memory management is :

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

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