When is a bus carrier exempted from the obligation to provide hotel accommodation under Article 21 of Regulation (EU) No 181/2011?

1. Whenever the delay was caused by congestion on the planned route
2. When the carrier proves that the cancellation or delay is caused by severe weather conditions or major natural disasters endangering the safe operation of bus services
3. Whenever the passenger booked a promotional discount fare
4. Whenever fuel prices increase by more than 5%