Disadvantage of cast perforated resin retained fpd is: (A) Weakening of metal retainer, (B) Wear of resin at perforation, (C) Less adhesion, (D) All of the above
Answer is D. Disadvantage:

Weakening of the metal retainer by the perforations.
Exposure to wear of the resin at the perforations.
Limited adhesion of the metal provided by the perforations.