Question 70

OSX is considered a closed source operating system.

OSX is developed by Apple and is proprietary software, which means its source code is not publicly available for modification or distribution.

A) Ubuntu

Ubuntu is an open-source operating system based on Linux. Its source code is freely available, allowing users to modify and distribute it, which directly contradicts the definition of closed source.

B) Android

While Android is based on open-source components, it is primarily distributed in a closed-source manner by Google, particularly with its proprietary apps and services. However, the core Android operating system itself includes open-source elements, making it not definitively closed source.

C) CentOS

CentOS is an open-source operating system derived from Red Hat Enterprise Linux. As with Ubuntu, its source code is available to the public, allowing for community contributions and modifications, thus it is not closed source.

D) OSX

OSX is a closed source operating system developed by Apple. Its source code is not accessible to the public, which means users cannot modify or distribute it without permission from Apple, fitting the definition of closed source perfectly.

Conclusion

OSX is definitively the correct answer as it meets the criteria for a closed source operating system, unlike the other options. Ubuntu and CentOS are open-source, and while Android includes some proprietary elements, it does not fit the strict definition of being entirely closed source like OSX does.