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Which lamp indicates that a driver assistance system is unavailable?

  • A.An amber symbol for the system concerned
  • B.A red stop lamp, which requires the vehicle to be halted whenever an assistance system becomes unavailable
  • C.No lamp
  • D.An amber warning specific to that system, often accompanied by a message explaining that it is temporarily unavailable

Answer: A

Assistance systems warn in amber and usually explain themselves in a text message. The last option describes exactly that presentation, which makes it a correct and more detailed version of the same answer. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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