When two drivers in a multi-manning coach operation switch driving roles at a rest stop, what procedure must they perform on the digital tachograph?

1. They simply change seats without touching the tachograph
2. They must swap their driver cards so that the new active driver's card is in Slot 1 and the new co-driver's card is in Slot 2
3. They must reset the tachograph back to factory settings
4. They must print 50 copies of the daily record sheet