A tank vehicle with three separate compartments carries UN 1202 Diesel Fuel in compartment 1, UN 1203 Petrol in compartment 2, and UN 1223 Kerosene in compartment 3. How can orange-colored plates be legally displayed under ADR 5.3.2.1.2?

1. A single plain orange plate mounted on the roof of the cab
2. Numbered orange plate for Petrol on the front and plain orange plate on the rear
3. Numbered orange plates on both sides of each compartment PLUS plain orange plates front and rear
4. Plain orange plates on both sides of each compartment only