Discussion
Which system opens a boot lid without the hands being used?
Answer: D
A sensor under the bumper detects the kick and the vehicle checks the key is present. The last option describes exactly that arrangement, which makes it a correct and more detailed version of the same answer. 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.
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