Under the Swiss Chauffeur Ordinance (ARV 1), what is the '12-Day Rule' (12-Tage-Regelung) for international occasional passenger transport (coach tourism)?

1. A rule that allows drivers to take 12 days of paid vacation every month
2. A rule that permits driving 24 hours a day for 12 days straight
3. A rule that replaces daily-rest requirements with one weekly rest at the end of a tour
4. A driver on a qualifying single international occasional passenger service may postpone weekly rest for up to 12 consecutive 24-hour periods, while daily driving, break and daily-rest rules still apply and compensating weekly rests follow