A user reports being billed for in-app purchases they did not make on their Android device. Which combination of controls BEST prevents unauthorized in-app purchase fraud on a shared device?

• A.Require purchase authentication for every transaction via Google Play settings and enable Family Library restrictions
• B.Enable the platform scanner and block installation from every source outside the official store on the shared handset the family uses
• C.Uninstall the affected application and reinstall it from a backup taken before all the charges appeared on the account statement
• D.Enable the screen lock and always switch off the contactless radio