Answer: (c)
The bevels for cast metal may slightly improve retention form when they are opposing bevels.
The bevels for cast metal are primarily to afford a better junctional relationship between the metal and the tooth.
Enamel margins of composite restoration have a beveled or flared configuration to increase both the surface area of etchable enamel.
Enamel margin of composite restoration is to maximize the effectiveness of the bond by etching more enamel rods ends.
The porcelain, resin-modified glass ionomer restorations and glass ionomer restorations require butt-joint (bulk of material at the margin) due to the brittleness and low tensile strength.
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