According to VIAS, what blood-alcohol maximum applies to professional truck, bus and taxi drivers in Belgium, compared with the general 0.5‰ limit?

1. The same 0.5‰ as ordinary drivers
2. 0.2‰ for professional drivers
3. 0.0‰ for every driver under 21, including C1
4. 1.0‰ if the tachograph is in rest mode