Which of the following is true of permanent first molars occlusal surface_____________?

A. Rhomboidal shape in maxillary molars and hexagonal shape in Mandibular molars

B. Mandibular molar has 1 major fossa, 2 minor fossa, 5 triangular ridges and 4 grooves

C. Maxillary molar has 2 major fossa, 2 minor fossa, 4 triangular ridges,1 oblique ridge and 5 grooves

D. All of the above

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