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
Upward compatibility
Universality
None of these
Upward mobility

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Operating System (OS)
Fork is

the creation of a new process
the dispatching of a task
the creation of a new job
None of these
increasing the priority of a task

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