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Which practice risks introducing such a fault?

  • A.Replacing a module with an identical unit, which restores the network to its original condition without any risk
  • B.Reading fault codes
  • C.Adding an aftermarket device on a long branch from the backbone, which creates an unterminated stub on the network
  • D.Splicing an accessory into the bus with a long tail

Answer: D

Aftermarket trackers and alarms spliced in on long tails are a recognised cause of intermittent bus faults. The last option describes exactly that practice, which makes it a correct and more specific statement. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking which component actually carries the load settles most questions of this kind at once. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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