1. Verification via push notification or location-based automated verification with the Salesforce Authenticator mobile app (version 2 or later) connected to the user’s account.
2. Verification via a U2F security key registered with the user’s account.
3. Verification code generated by a mobile authenticator app connected to the user’s account.
4. Verification code sent via SMS to the user’s verified mobile phone.
5. Verification code sent via email to the user’s email address.