Which of the following will have maximum stabilization due to crystal field?

The given complexes are: <br/><br/> $\left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+},\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+},\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{-3},\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}$ <br/><br/> $\mathrm{CN}^{-}$is the strongest ligand among the given complexes CFSE value for the $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{-3}$ complex will be highest as it has $d^{6}$ configuration with a CFSE value of $-2.40 \,\Delta_{0}+2 \mathrm{P}$, where $P$ represents pairing energy and $\Delta_{0}$ represents splitting energy in octahedral field. <br/><br/> The value of $\Delta_{0}$ is high for cyanide complexes.