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Q: Which of the following is NOT an open-source operating system?
  • A. Ubuntu
  • B. Windows
  • C. Linux
  • D. Drupal
Correct Answer: Option B - Ubuntu, Linux and Drupal are an open source operating system. Firefox, Chrome, Opera office are some popular examples of open source software. While Microsoft Windows is probably the most popular piece of closed source software out there.
B. Ubuntu, Linux and Drupal are an open source operating system. Firefox, Chrome, Opera office are some popular examples of open source software. While Microsoft Windows is probably the most popular piece of closed source software out there.

Explanations:

Ubuntu, Linux and Drupal are an open source operating system. Firefox, Chrome, Opera office are some popular examples of open source software. While Microsoft Windows is probably the most popular piece of closed source software out there.