CompTIA Mobility+ Exam Prep

Answer: C - This mobile device is likely running a closed-source operating system, sine the user purchased his mobile device at the Apple store.

Key Takeaway - Closed-source software is generally vendor-specific and is not open to download for developers (except for application developers, who can download a software development kit, or SDK); thus, Apple’s mobile operating system iOS (currently in version 6) is a closed-source operating system. Android, created by the Open Handset Alliance (directed by Google), is open-source and, therefore, developers can download the software for their own customizations and use. The Linux operating system, which you can download on the Internet for free, is another example of an open-source operating system (in fact, Linux is the basis for Android).