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Which of the following choices is not an operating system? A. DOS B. UNIX C. Windows 97 D. Windows Vista
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Which of the following choices is not an operating system? A. DOS B. UNIX C. Windows 97 D. Windows Vista

User Hujaakbar
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A. Cuz all the other ones are known world wide
User Robusto
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It should be A. DOS because all of the others are operating systems.
User KSletmoe
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