Under Article 9(1) of Regulation (EC) No 561/2006 (the Ferry/Train Rule), how may a regular daily rest period of 11 hours be interrupted?

1. It may be interrupted at most twice by other activities not exceeding 1 hour in total, provided the driver has access to a sleeper cabin, bunk, or couchette
2. It may be interrupted up to three times for a total of 2 hours, provided the vehicle remains on the ferry deck
3. It may be interrupted once for up to 90 minutes to board the ferry, but the driver must sleep in the truck cabin on deck
4. It cannot be interrupted under any circumstances; any movement resets the 11-hour rest timer to zero