Discussion
Which sensor enables automatic main beam control?
Answer: C
The camera recognises headlamps and tail lamps ahead and dips or shapes the beam accordingly. Photocell based automatic dipping genuinely was tried decades ago, which makes the last option a real historical system. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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