Multiple choice general knowledge science & technology

Which of the following operating systems is produced by IBM?

  1. OS-2

  2. Windows

  3. DOS

  4. UNIX
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A Correct answer
Explanation

OS/2 (originally written as OS-2 in some contexts) was an operating system developed by IBM and Microsoft in the late 1980s. While it eventually became solely IBM's product, it remains the only option listed that was produced by IBM.

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