Under the 'ferry or train derogation' (Art. 9(1) of VO (EG) 561/2006), how may a coach driver interrupt a regular daily rest period when accompanying a bus on a ferry crossing?

1. The rest may be interrupted up to four times for any duration
2. The regular daily rest period (of at least 11 hours) may be interrupted not more than twice by other activities not exceeding 1 hour in total, provided the driver has access to a sleeper cabin, bunk, or couchette
3. The driver may drive for up to 3 hours while on board the ferry deck
4. The rest may be interrupted only if the ferry travels at less than 10 knots