Discussion
Which caution applies to unplugging modules during diagnosis?
Answer: C
Unplugging a terminating module doubles the bus resistance and can appear to cause a fault. The last option explains exactly that trap, which makes it a correct and more instructive version of the same caution. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. 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.
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