Multiple choice general knowledge

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 (Operating System/2) was an operating system developed jointly by IBM and Microsoft in the 1980s. After the partnership ended, IBM continued developing OS/2 on its own. The other options are incorrect: Windows is produced by Microsoft, DOS was created by Microsoft (and licensed to IBM as PC-DOS), and UNIX originated at Bell Labs (though IBM has its own UNIX variant called AIX). Note: The question writes it as "OS-2" but the correct name is "OS/2" - this is a minor formatting issue.

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