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  1. DOS is a
    1. Direct Operating System
    2. Dual Operating System
    3. Disk Operating System
    4. Dial-up Operating System
Correct Option: C

DOS ("Disk Operating System) is an acronym for several closely related operating systems that dominated the IBM PC compatible market between 1981 and 1995, or until about 2000 including the partially DOS-based Microsoft Windows versions 95, 98, and Millennium Edition.


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