Under Article 3(a) of Regulation (EC) No 561/2006, which passenger transport services are legally exempt from the requirement to use a digital tachograph and follow EU driving/resting rules?

1. Vehicles used for the carriage of passengers on regular services where the route covered by the service does not exceed 50 kilometres
2. All international tourist coaches with more than 50 seats
3. Any bus driving on Austrian motorways on Sundays
4. Night buses operating between Vienna and Berlin