$Cr{O}_4^{-2},C{r}_2{O}_7^{-2},Mn{O}_4^{-},Mn{O}_4^{-2}$  How many  in the list exhibit colour due to charge transfer phenomenon

$Mn{O}_4^{-}, Cr{O}_4^{-2} , C{r}_2{O}_7^{-2}\left(d^o\right)$….Colour is  due to charge transfer phenomenon

$Mn{O}_4^{-2}\left(d^1\right)$ ….Contains one  unpaired electron, colour is due to d-d transitions