How is the hazard pre-warning device used?

A)It will be used together with the emergency light if the vehicle is equipped with it.Correct
B)It will be used together with the emergency light and position light, in any case.
C)Only the hazard pre-warning device will be used, even if the vehicle has emergency lights.
The hazard pre-warning device is used together with the emergency lights, both during the day and at night, whenever the vehicle is equipped with them. In adverse weather conditions or between sunset and sunrise, position lights must also be switched on.
The V-16 hazard pre-warning device is an auto-yellow luminous device, type-approved and with geolocation, which operates on autonomous power (battery). It must be placed at the highest point of the immobilised vehicle, ensuring maximum visibility. Currently, the V-16 is the only legal option for signalling an immobilised vehicle or an obstacle on the road, with the pre-warning triangles falling out of use.
The V-16 hazard pre-warning device is an auto-yellow luminous device, type-approved and with geolocation, which operates on autonomous power (battery). It must be placed at the highest point of the immobilised vehicle, ensuring maximum visibility. Currently, the V-16 is the only legal option for signalling an immobilised vehicle or an obstacle on the road, with the pre-warning triangles falling out of use.