Final answer:
Android is an open-source platform.
Step-by-step explanation:
Android is a mobile operating system that is known for being open-source. This means that the source code of the operating system is freely available to the public, allowing developers to modify and customize it as they wish.
Android is not a paid platform, as anyone can download and use it on compatible devices without having to purchase a license.
Therefore, the correct answer to the question is: Android is an open-source platform.