Under Article 83 of the Road Traffic Safety Law Implementation Regulations, what is the passenger carrying rule for motorcycles traveling on expressways?

1. One adult passenger is permitted if wearing a full-face helmet
2. Two-wheeled motorcycles are strictly prohibited from carrying any passengers on expressways (两轮摩托车在高速公路行驶不得载人)
3. Passengers under 60 kg are permitted in daytime only
4. Passengers are permitted if the motorcycle displacement exceeds 600 mL