For a diatomic gas, if γ_1=(Cp/Cv) for rigid molecules and γ_2=(Cp/Cv) for another diatomic molecules, but also having vibrational modes. Then, which…

For a diatomic gas, if $\displaystyle \gamma_1=\left(\frac{\mathrm{Cp}}{\mathrm{Cv}}\right)$ for rigid molecules and $\displaystyle \gamma_2=\left(\frac{\mathrm{Cp}}{\mathrm{Cv}}\right)$ 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)