Which equation expresses the solubility product of Zn3(PO4)2?

a. Ksp = [Zn2+][PO43]

b. Ksp = [Zn2+]3 [PO43]2

c. Ksp = 6[Zn2+][PO43]2

d. Ksp = 108[Zn2+][PO43]2​