Must the reversing manoeuvre be signalled?

A)Yes, using the hazard signal or by repeated use of the brake light.
B)No, it is not mandatory to signal the reversing manoeuvre.
C)Yes, with the reversing light.Correct
When we select reverse gear on the gear lever, a white light at the rear of the vehicle automatically turns on, indicating that the vehicle is moving backwards.
In the event of a failure of the reversing light, we must signal it by extending the arm with the palm of the hand facing backwards.
If there is a contradiction between the vehicle's light signal and the signal indicated by the driver with their arm, we must obey the driver, since the light signal may be faulty.