Discussion
Which addressing scheme does a controller area network use?
Answer: B
Messages are labelled by what they contain rather than by who should receive them. The last option describes exactly that scheme, which makes it a correct and more explanatory version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The order in which the effects act is what decides the outcome, so it is worth establishing first. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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