For a diatomic gas, if y1 = (cp/cv) for rigid molecules and y2 = (cp/cv) for another diatomic molecules, but also having vibrational modes.

For a diatomic gas if y1= Cp/Cv for rigid molecules and y2 = Cp/Cv for another diatomic molecules, but also having vibrational modes.Then, which one of the following options is correct ?

(Cp and Cv are specific heats of the gas at constant pressure and volume)

                                                                      (JEE-2025)