About Trailer coupling and licence plate: which statement is WRONG?

1. Trailers with a breakaway braking device may NOT also have an auxiliary coupling; the two work in opposite ways (book p.231) and combining them is a defect, not extra safety.
2. The coupling of every trailer must always have an approval mark and be properly fastened, regardless of weight or which braking device was chosen.
3. ✓ An auxiliary coupling is a valid alternative to a breakaway braking device for any trailer, regardless of weight.
4. It is exactly the reverse. Up to 750 kg: white plate with the towing car's registration. Above 750 kg: own registration certificate with a yellow plate and its own registration number.

Correct answer: An auxiliary coupling is a valid alternative to a breakaway braking device for any trailer, regardless of weight.

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