Does the rotating light carried by special vehicles grant them priority over other drivers?

A)Yes, in any case.
B)Yes, when they are travelling with it switched on.
C)No, it only signals their position.Correct
Special vehicles or vehicles operating under a special transport permit, among others, must use an amber rotating light (yellow-auto), 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 malfunction of this V-2 light signal, they must use the dipped headlights together with the hazard warning lights.
This light only signals the position of the vehicles; it does not grant them priority.