A.
You can choose one or more method of your choice. It is not necessary to register for all three.
If you are already using biometric authentication on your device, we recommend that you use "Biometric authentication, passcode authentication, etc.".
If you use multiple computers and smartphones, we recommend using "One Time Passwords (app)" or "One Time Password Authentication (email)". If you are not adept at using technology, we recommend "One Time Passwords Authentication (email)". It is easy to set up and operate.
For detailed information on how to register, please refer to the Expo ID Registration Manual below.
ExpoID Registration Manual: