The number of species from the following that are involved in sp^3 d^2 hybridization is [ Co ( NH_3)_6]^3+, SF_6,[ CrF_6]^3-,[ CoF_6]^3-,[ Mn ( CN…

The number of species from the following that are involved in $\displaystyle \mathrm{sp}^3 \mathrm{~d}^2$ hybridization is $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}, \mathrm{SF}_6,\left[\mathrm{CrF}_6\right]^{3-},\left[\mathrm{CoF}_6\right]^{3-},\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$ and $\displaystyle \left[\mathrm{MnCl}_6\right]^{3-}$