Operating System (OS)
The higher versions of the operating systems are so written that programs designed for earlier versions can still be run. What is it called?

Upward mobility
Upgradability
Upward compatibility
Universality
None of these

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Operating System (OS)
Memory management is :

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

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