​Which of the following is the first completely open source mobile operating system developed by Google, meaning that it is free to any cell phone mobile network?​

Correct option is C

Android is the first completely open source mobile operating system developed by Google. It is based on the Linux kernel and is available free of charge to mobile phone manufacturers and network providers. This openness allows broad customization and widespread adoption across various devices globally. Unlike other operating systems like iOS (closed source), Symbian (developed by Nokia, now discontinued), or Windows (commercial product by Microsoft), Android's open-source nature has made it dominant in the mobile OS market. Hence, option (c) is correct.
Information Booster:
1. Android was officially released in 2008 and is managed by the Open Handset Alliance.
2. Its open-source model enables developers to modify and distribute the OS freely.
3. Android supports a wide range of devices, from smartphones to tablets and wearables.
4. Google Play Store is the official app marketplace for Android devices.
5. Android’s flexibility has driven its global market dominance.
6. Symbian was popular before smartphones but is no longer widely used.
7. iOS is proprietary to Apple devices, and Windows Mobile has been largely phased out.
Additional Knowledge:
• Symbian was primarily used by Nokia before smartphones became dominant.
• iOS offers a closed ecosystem with strict control by Apple.
• Windows Mobile was Microsoft's early attempt at mobile OS but lost market share.