GKFix MCQ Question

What is the correct expression for the solubility product of iron(III) phosphate (FePO₄)?

• A. Ksp = [Fe²⁺][PO₄³⁻]
• B. Ksp = [Fe³⁺]²[PO₄³⁻]²
• C. Ksp = [Fe⁺][PO₄³⁻]
• D. Ksp = [Fe³⁺][PO₄³⁻]