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Which lamp does a trailer socket also commonly supply?

  • A.Nothing further
  • B.A reversing lamp supply, which is carried on the thirteen pin socket and permits the trailer to show a white lamp
  • C.A permanent supply for a caravan's habitation circuits
  • D.The interior lighting of the towing vehicle, which is extended to the trailer through the additional pins provided

Answer: C

The thirteen pin socket carries permanent and ignition controlled supplies for a caravan as well as the lighting. Reversing lamp supply genuinely is one of those additional pins, which makes the last option a real function of the same connector. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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