Zirconium phosphate $\left[{\mathrm{Zr}}_3{\left({\mathrm{PO}}_4\right)}_4\right]$ dissociates into three zirconium cations of charge​ $+4$ and four phosphate anions of charge $-3$. If molar solubility of zirconium phosphate is denoted by $\mathrm{s}$ and its solubility product by ${\mathrm{K}}_{\mathrm{sp}}$ then which of the following relationship between $\mathrm{s}$ and ${\mathrm{K}}_{\mathrm{sp}}$ is correct ​?

• A

  $\text{S}={\left\{{\text{K}}_{\text{sp}}/6912\right\}}^7$
• B

  $\text{S}={\left\{{\text{K}}_{\text{sp}}/144\right\}}^{1/7}$
• C

  $\text{S}=\left\{{\text{K}}_{\text{sp}}/{\left(6912\right)}^{1/7}\right\}$
• Correct answer
  D

  $\text{S}={\left({\text{K}}_{sp}/6912\right)}^{1/7}$

Hence, the correct answer is option: 'D'.