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

The higher versions of the operating systems are so written that progr

1.	The higher versions of the operating systems are so written that programs designed for earlier versions can still be run. What is it called?
A.	Upgradability
B.	Upward mobility
C.	Universality
D.	Upward compatibility
E.	None of the above
Answer» E. None of the above

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

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