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Which of the following does not support more than one program at a time?

A. DOS

B. Linux

C. Windows

D. Unix

Answer: Option A

Solution(By Examveda Team)

DOS is a family of disk operating systems. DOS primarily consists of MS-DOS and a rebranded. Only one program at a time can use them and DOS itself has no functionality to allow more than one program to execute at a time.

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