Which commercial vehicle needs a "towing permit" for the purpose of towing?

1. AA vehicle whose permissible total weight is more than 6,000 kg.
2. BA vehicle whose permissible total weight is more than 10,000 kg.
3. CA vehicle whose permissible total weight is more than 3,500 kg.
4. DA vehicle whose permissible total weight is more than 8,000 kg.

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