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AUNIX

BDOS

CSystem software

DApplication software

Answer:

UNIX - UNiplexed Information Computing System. A highly popular and multitasking Operating system, launched in 1969

Related Questions:

Which of the following statements are true?

In Non preemptive scheduling process can't be interrupted until it terminates itself or its time is over.
In this, once the resources (CPU cycle have been allocated to a process, the process holds it until it completes its burst time or switches to the 'wait' state.