Question d'erreur

[sucette]

Question
The doorbell doesn't ring.

When can you overtake a vehicle from the left at this level crossing?

A. Only if the barrier is open AND the white moonlight burns at the same time.

B. If the barrier is open and the lunar white light does not burn, because it is defective

the right answer was B ? but it’s supposed to be A

[GRO]

If the barrier is open AND/OR the white moonlight burns at the same time.
The word ONLY makes answer A wrong.