Discussion
Which conclusion follows from both lines sitting at zero volts?
Answer: B
The idle level is set by the transceivers and should be about two and a half volts. The last option explains exactly why zero is wrong, which makes it a correct and more instructive version of the same answer. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming what changes and what stays the same is the reliable route through questions of this shape. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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