Which of the following represents the correct solubility product expression for calcium phosphate?
- A$[Ca^{2+}] [PO_4^{3-}]$
- B$[Ca^{2+}] [PO_4^{3-}]^2$
- C$[Ca^{2+}]^3 [PO_4^{3-}]^2$
- D$[Ca^{2+}]^2 [PO_4^{3-}]^2$
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