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  • IT: Operating Systems
  • Which of the following is not an OS?
Multiple choice

Which of the following is not an OS?

  1. OSX

  2. AT&T

  3. Windows

  4. UNIX

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

AT&T is a telecommunications company, not an operating system. OSX, Windows, and UNIX are all operating systems.

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