What is the legal rule under European and modern AETR regulations regarding taking the regular 45-hour weekly rest inside the truck cabin?

1. The regular 45-hour weekly rest must NOT be taken inside the vehicle cabin; it must be taken in suitable gender-friendly accommodation with adequate sleeping and sanitary facilities paid for by the employer
2. The regular 45-hour rest must always be spent sleeping in the truck cab
3. Drivers must sleep in the cargo trailer among the pallets
4. Weekly rest can only be taken in police station dormitories