Under Chinese traffic safety regulations, what is the passenger carrying restriction for light motorcycles / mopeds (轻便摩托车 / Class F license)?

1. Light motorcycles may carry one adult passenger if traveling below 20 km/h
2. Light motorcycles / mopeds are strictly prohibited from carrying ANY passengers under all circumstances (轻便摩托车不得载人)
3. Light motorcycles may carry up to two children under 6 years of age
4. Light motorcycles may carry passengers only on national highways