Chrome alum is a salt made up of two different cations together with one anion. The ions present in chrome alum are $\text{K}^+$, $\text{Cr}^{3+}$ and $\text{SO}_4^{2-}$. What is the formula of this salt?
- A$\text{KCrSO}_4$
- B$\text{KCr(}\text{SO}_4\text{)}_2$
- C$\text{KCr(}\text{SO}_4\text{)}_3$
- D$\text{K}_2\text{Cr(}\text{SO}_4\text{)}_3$