If you hover over the feature it describes it.
This chart has descriptions of MFA features and shows which plans include which features. As you can see, free and dev plans do not include any MFA (pro or enterprise). Dev Pro includes Pro MFA, which is DUO, and other OTP apps like Google Authenticator. Enterprise MFA includes SMS and email, in addition to push notifications and the Auth0 Guardian app.
If you have any more in-depth pricing questions, I encourage you to connect with our sales team. We typically deal with more technical support questions. 