A B-category car of 2,000 kg tows a 1,800 kg trailer (combination 3,800 kg, under 4,250 kg). What extra entitlement does Art. 155 require?

1. No extra entitlement; ordinary Category B always covers this combination
2. Category C, because the trailer exceeds 750 kg
3. Training and a test, with the right shown on the licence by the relevant Community code
4. A second driving licence issued only for trailers