A rider is below age 24 with a Croatian-issued Category A licence and has any alcohol in the blood. Which rule is most relevant?

1. Young drivers must not drive with alcohol in the blood, even though the general A-category threshold is above 0.50 g/kg for non-young drivers
2. The rider may use the non-young-driver 0.50 g/kg threshold because Category A is never covered by young-driver rules
3. Alcohol rules apply only to car drivers
4. The rider may ride if wearing a homologated helmet