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A wireless link is chosen over a wired one for a sensor mainly when

  • A.the latency must be bounded tightly
  • B.running a cable is impractical or expensive
  • C.the data rate required is very high
  • D.the power available is very limited

Answer: B

Installation cost, moving parts and inaccessible locations are what justify the radio, since on every technical measure a wire is better. Wireless costs power, adds latency that is hard to bound and brings a whole class of interference problems with it.

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