The correct answer is A) Molded. The term "molded" indicates that the dimension is measured from the inner face of the shell or deck plating. This is the standard convention used in maritime regulations and vessel measurements, as it provides a consistent reference point for determining the actual internal dimensions of a vessel, rather than relying on external dimensions which can vary due to hull curvature or other structural features. The other options are incorrect because they do not specifically refer to the measurement being taken from the inner face of the shell or deck plating. "Tonnage" and "Register" are related to vessel size and capacity calculations, while "Effective" is a more general term that does not clearly specify the reference point for the measurement.