When calculating how many people are being carried on a bus in scheduled line service (Kraftfahrlinienverkehr) in Austria, how are children counted?

1. Every child counts as one person, whatever their age
2. Children under 14 are not counted at all
3. Three children under 14 count as two people, and children under six are not counted
4. Two children under 12 count as one person, and children under three are not counted