What is an agricultural transport cart (landwirtschaftlicher Transportkarren) and what is its maximum design speed under Category F?

1. A specialised motor vehicle with an integrated loading bed used in agriculture/forestry, limited to a design speed of 50 km/h
2. A high-speed motorway transporter with a design speed of 100 km/h
3. A tracked military tank converted for civilian wood clearing with unlimited speed
4. A non-motorised handcart pulled by horses