What are the requirements regarding the chains installed between the towed and the towing vehicle?

1. AThey must allow earthing of the accumulated electrical charge (static electricity) in the vehicle while driving.
2. BTheir links must be at least 12 mm thick.
3. CThey must prevent the creation of a 90-degree angle (the jackknife) between the towing and the towed vehicle.
4. DThey must allow a turn of at least 90 degrees of the towed vehicle, relative to the towing vehicle.

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