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Which order suits a systematic network diagnosis?

  • A.Modules first, since replacing the suspect unit is the fastest means of confirming where the fault actually lies
  • B.Any order
  • C.Confirm the complaint, read the codes, verify the supplies, test the bus physically, and only then suspect a module
  • D.Symptoms, codes, supply and earth, wiring, then modules

Answer: D

Working from the cheap and likely to the expensive and rare is the discipline. The last option lists exactly that sequence, which makes it a correct and more explicit version of the same principle. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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