The orange colour of $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ and purple colour of $\mathrm{KMnO}_4$ is due to

1. A Charge transfer transition in both. Correct answer
2. B $\mathrm{d} \rightarrow \mathrm{d}$ transitions in $\mathrm{KMnO}_4$ and charge transfer transitions in $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$.
3. C $\mathrm{d} \rightarrow \mathrm{d}$ transitions in both
4. D $\mathrm{d} \rightarrow \mathrm{d}$ transitions in $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ and charge transfer transitions in $\mathrm{KMnO}_4$.