Discussion
Which method does a bulb failure module use on an older vehicle?
Answer: D
Current sensing reed switches or comparators watched the lamp feeds and lit a warning lamp. Comparing paired circuits genuinely is how many such modules worked, which makes the last option a real implementation of the same idea. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming what changes and what stays the same is the reliable route through questions of this shape.
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