Give the expression for the solubility product constant for Cr₂(CO₃)₃.
a. [3Cr³⁺]²/2CO₃²⁻]³ / Cr₂(CO₃)₃
b. [3Cr³⁺]³[2CO₃²⁻]2²
c. [Cr³⁺]²[CO₃²⁻]³
d. [3Cr³⁺]³ [2CO₃²⁻]² / Cr₂(CO₃)₃
e. Cr₂(CO₃)₃ / [2Cr3+]²[3CO₃²⁻]³