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Which cost does an unnecessary module replacement carry?

  • A.None
  • B.The component cost together with the coding and programming labour, while the original fault remains present
  • C.The part, the programming and the unresolved fault
  • D.The part alone, which may be returned to the supplier if it proves not to have cured the fault reported

Answer: C

A coded module usually cannot be returned, and the fault is still there. The last option states both parts of that cost, which makes it a correct and fuller version of the same answer. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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