Operating System (OS)
A form of code that uses more than one process and processor, possibly of different type, and that may on occasions have more than one process or processor active at the same time, is known as

multiprogramming
broadcasting
multithreading
time sharing
None of these

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Operating System (OS)
Memory management is :

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

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