What does Ordinance No. 40 require of crew members regarding fire extinguishers?

1. They must know how to use them, and the vehicle must carry serviceable extinguishers with the next-service date marked
2. Extinguishers may be empty as long as the red cylinder is visible
3. Only the consignee needs to know how to use them
4. Water extinguishers must be filled from any roadside ditch before departure