Under what condition may UN 0336 (Fireworks 1.4G) and UN 0335 (Fireworks 1.3G) be loaded together on the same vehicle?

1. They can never be loaded together under any circumstances
2. They may be loaded together, but the entire load must be treated as Division 1.3G
3. They can be loaded together only if the driver carries 4 fire extinguishers of 12 kg each
4. They can be loaded together only during nighttime transport hours