Are rubber-tracked tractors (Raupenschlepper) covered by Category F when operated on public roads in Austria?

1. No, tracked vehicles are banned from public roads and may only be moved on a low-loader
2. Yes, but only where the tracks are fitted with steel cleats that grip the road surface
3. No, because tracked machines cannot be given a Bauartgeschwindigkeit rating
4. Yes, provided they are roadworthy, do not damage the road surface and have a design speed of not more than 50 km/h