Which one of the following is coloured due to d-d- transitions

${\mathrm{Mn}}^{+7}\left({\mathrm{KMnO}}_4\right), {\mathrm{Cr}}^{+6}({\mathrm{K}}_2{\mathrm{CrO}}_4,{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7) \mathrm{have} {\mathrm{d}}^{\mathrm{o}}$ configuration. Colour in these compounds is due to charge transfer phenominon (L→M). ${\mathrm{Mn}}^{+6}\left({\mathrm{K}}_2{\mathrm{MnO}}_4\right) \mathrm{has} {\mathrm{d}}^1$ configuration. It shows colour due to d-d transitions.