On an urban road, what is the speed limit (in k.p.h) for a commercial vehicle with an all up weight of more than 12,000 kg?

1. A 50 k.p.h.- even if there is a road sign permitting to drive at a higher speed.
2. B 50 k.p.h.- if there is a road sign permitting to drive at a higher speed, the vehicle is permitted to drive at the speed indicated in the sign.
3. C 60 k.p.h.- even if there is a road sign permitting to drive at a higher speed.
4. D 60 k.p.h.- if there is a road sign permitting to drive at a higher speed, the vehicle is permitted to drive at the speed indicated in the sign.