Which of the following is a popular example of an open-source operating system?

The correct answer is (C) Ubuntu

Explanation:
● Ubuntu is a popular open-source operating system based on Linux.
● Its source code is freely available for use, modification, and distribution.
● It is widely used on desktops, servers, and cloud platforms.

Information Booster:
● Open-source operating systems allow users to study and modify the code.
● Linux-based systems are commonly used in servers and supercomputers.
● Ubuntu is known for its user-friendly interface and strong community support.

Additional Knowledge:
● iOS, macOS, and Windows are proprietary operating systems.
● Ubuntu is developed and maintained by Canonical Ltd.