What are the legal conditions and liability limits for providing hotel accommodation to passengers under Article 21 of Regulation (EU) No 181/2011 when a journey delay necessitates an overnight stay?

1. The carrier is never required to provide accommodation under any circumstances
2. The carrier must offer hotel accommodation (or other accommodation) plus transport to/from the terminal, but may limit the total cost to EUR 80 per night per passenger for a maximum of 2 nights
3. The carrier must pay for 5-star hotel suites with unlimited stay duration
4. The carrier can require passengers to sleep on terminal floor benches indefinitely