The answer is D.
Answer 2 is not correct. Conventional glass ionomers release fluoride into the surrounding tooth at a greater amount that compomers. This gives them a higher anticariogenic effect. Glass ionomer have low wear resistance, and relatively low strength compared to composite or amalgam. Compomers have improved strength and wear resistance with the combination of composite and glass ionomer.
Roberson T.M., Heymann H.O., and Swift E.J. Studervant’s Art & Science of Operative Dentistry, Fourth Edition, Mosby Inc. 477-478.

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