How do monolithic zirconia crowns differ from layered zirconia crowns?

How do monolithic zirconia crowns differ from layered zirconia crowns?

• A. Monolithic crowns are a single material without veneer porcelain; layered crowns have porcelain veneer for esthetics but are more prone to chipping.
• B. Monolithic crowns require veneer porcelain; layered crowns are a single material.
• C. Monolithic crowns incorporate a metal substructure.
• D. Layered crowns have no porcelain veneer and rely on monolithic core.

Answer: (A)