In which situations is it permitted to sound a warning signal with the horn on an urban road?

1. AThe horn may be used only to prevent an imminent danger that cannot be prevented in any other way.
2. BHonking is permitted in any situation, provided that the signal is given in a prolonged and uniform manner.
3. CHonking is permitted only with an air horn.
4. DThe horn may be used on an urban road in any situation.

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