Which of the following is NOT true about an app URL scheme?

Q) Which of the following is NOT true about an app URL scheme?
Ans:

The scheme is a part of the link that identifies which app to open 
Schemes are automatically set up when you create your app
Typically the website name appears in reverse; e.g., example.com becomes com.example as a scheme
You can use “http” or a custom scheme that can start with the app or website name