Discussion
Which signalling method does a controller area network use?
Answer: C
One line rises and the other falls, and the receiver reads the difference, which cancels induced noise. The last option describes exactly that scheme, which makes it a correct and more detailed statement. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared behaviour explains why these belong together and the differences explain why both exist. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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