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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?

  • A.Upgradability
  • B.Upward mobility
  • C.Universality
  • D.Upward compatibility

Answer: D

Correct answer: Upward compatibility

Upward compatibility means a later version still runs what was written for the earlier ones, so users can move to the new system without abandoning their existing programs. It constrains the designers, but without it few would upgrade.

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