How must this combination of vehicles make its presence known on the road?

How must this combination of vehicles make its presence known on the road?
A)Using the hazard warning signals.
B)With an amber flashing light.
C)Using an amber rotating light both day and night.Correct
Special vehicles or those operating under special transport conditions, among others, must use an amber rotating light, visible from all directions at a distance of 100 m, both day and night, whenever they travel on public roads at a speed not exceeding 40 kilometres per hour.
In the event of a failure of this V-2 light signal, they must use the dipped headlights together with the hazard warning signal.
This light only indicates the position of the vehicles; it does not grant them priority.