A moped rider is using a protected, belt-equipped light quadricycle and a two-wheel moped on different days. Which statement best applies the helmet rules?

1. Helmet is normally mandatory on the two-wheel moped; in the protected belt-equipped vehicle, the belt must be used and the helmet exemption applies
2. Helmet is never required for AM vehicles
3. A seat belt on one vehicle removes helmet duties on every other moped
4. Helmet is required only outside towns on both vehicles