Computer Hacking Forensic Investigator (CHFI) Practice Exam 2026 – The Complete All-in-One Guide to Exam Mastery!

The correct choice is Android, as it is a free and open-source mobile operating system. Developed by Google, Android is based on the Linux kernel and is designed primarily for touchscreen mobile devices such as smartphones and tablets. Its open-source nature means that anyone can access the source code, modify it, and distribute their versions of the operating system. This has led to a vast ecosystem of Android-based devices and custom firmware options created by both manufacturers and developers.

In contrast, other operating systems included in the options are either proprietary or have limited source access. Web OS, while initially open source, was proprietary under Palm and later HP and does not maintain the same level of open-source principles as Android. Apple iOS is a closed-source operating system exclusive to Apple hardware, limiting user access to its source code and preventing modifications. Symbian OS, once widely used, was also proprietary and now has been largely phased out and lacks the active community contributions characteristic of a truly open-source platform.