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?

Upgradability
None of these
Upward compatibility
Upward mobility
Universality

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Operating System (OS)
Object code

must be rewritten before execution
is the output of compilers, but not assemblers
None of these
must be "loaded" before execution
is ready to execute

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