If you created a Flutter app using the Firebase services where the app users had to login to this App using Firebase user accounts (email and password), which of the following Firebase products store these app users' accounts?

If you created a Flutter app using the Firebase services where the app users had to login to this App using Firebase user accounts (email and password), which of the following Firebase products store these app users’ accounts?

If you created a Flutter app using the Firebase services where the app users had to login to this App using Firebase user accounts (email and password), which of the following Firebase products store these app users’ accounts?
A . Database
B . Authentication
C . Storage
D . Hosting

Answer: B