Question No$.5(5$ pts$.)$

Which of the following electronic transitions of the ion $H{e}^{+}$emit a photon with the same energy?

a$.4p$ to $2s$ and $4f$ to $2p.$

b$.3p$ to $3s$ and $4d$ to $4s.$

c$.$ There are no $2$ transitions that emit the same$-$energy photon in $H{e}^{+}$

d$.3d$ to $2s$ and $4p$ to $2s.$

e$.3s$ to $2s$ and $4s$ to $3s.$