The true statement about the Android operating system is:
Android is open-source software.
While Android does have desktop-like versions (such as Android-x86) and while it usually comes with the Google App Store on devices that are certified by Google, it is not classified as a desktop operating system in the traditional sense, and it does not strictly require the Google App Store to function. Many Android devices can operate without the Google ecosystem, using alternative app stores or sideloading apps.