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The greatest hazard of a field update mechanism is that

  • A.a failed update can leave the unit unable to start
  • B.the update takes longer than the user will tolerate
  • C.the new firmware may be larger than the old
  • D.the update cannot be verified before it is applied

Answer: A

A power failure part way through, or a corrupted image, must leave the unit still able to try again, which means the loader itself is never overwritten and the image is verified before it is committed. Two application banks with a fallback is the robust arrangement.

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