Discussion
Which automatic locker engages without driver action?
Answer: D
Ratchet lockers drive both wheels until one overruns, at which point that side ratchets freely, so the unit locks under power and unlocks on a corner. The characteristic clicking and the abrupt handling are well known. Viscous and electronic units also act automatically by different means. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming what changes and what stays the same is the reliable route through questions of this shape.
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