1- Authenticator App: for this option you need to install an external app to authenticate the login. There are several available, if you do not know any yet, we recommend the Microsoft, for more information you can visit their web site.
If you select this type of authentication an option will open to scan a QR code to link the application previously installed on your devices.
After completing the process of linking your app for authentication, every time you log in to your account you will need to enter the security code that will be generated in the app.