Which characteristic is the most reliable and consistent for distinguishing between the maxillary first, second, and third molars?

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Quantity of roots presentDepth of the central fossaSize comparison of the cusp of CarabelliLocation of the distolingual groove relative to other featuresShape of the occlusal surface

Explanation

Among various features, the relative position of the distolingual groove remains the most dependable and consistent trait to differentiate maxillary first, second, and third molars, unlike the number of roots, central fossa depth, or cusp of Carabelli size which can vary more.