Discussion
Which state is described as dominant on a controller area network?
Answer: B
A dominant bit is driven and wins over a recessive one, which is how arbitration works. The last option states exactly that relationship, which makes it a correct and more precise version of the same answer. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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