HgCl2 and I2 both when dissolved in water containing I− ions, the pair of species formed is

Question

$\require{mhchem}\ce{HgCl2}$ and $\ce{I2}$ both when dissolved in water containing $\ce{I-}$ ions, the pair of species formed is

(a) $\ce{HgI2,\ I-}$

(b) $\ce{HgI4^{2-},\ I3-}$

(c) $\ce{Hg2I2,\ I-}$

(d) $\ce{HgI2,\ I3-}$