Which of the Following Features Help with Distinguishing a Right

Which of the following features help with distinguishing a right permanent mandibular first premolar from a left?

A) The mesial cusp slope of the buccal cusp is shorter than the distal cusp slope.
B) The cementoenamel curvature is more occlusal on the distal surface.
C) The mesiolingual groove can be seen near the buccal margin.
D) The mesial marginal ridge is nearly perpendicular to the transverse ridge angulation at a more cervical level.