How is a bus that must be stopped at night on a non-urban road marked?

1. AWith a warning triangle visible to those coming from behind from a distance of at least 100 metres, and by operating the bus's hazard lights.
2. BThere is no obligation to mark it, but it must be towed away from the place immediately.
3. CIt is marked like any other vehicle.
4. DWith a warning triangle visible to those coming from behind from a distance of 50 metres, and with a flashing yellow light visible from a distance of 100 metres.

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