CompTIA A+ Core 2 (220-1102) — Question 155

Which of the following operating systems is considered closed source?

Answer options

• A. Ubuntu
• B. Android
• C. CentOS
• D. OSX

Correct answer: D

Explanation

The correct answer is OSX, as it is developed by Apple and not open for public modification. In contrast, Ubuntu, Android, and CentOS are open-source operating systems, allowing users to view and modify their source code.