Which statements are correct about degrees of freedom?

A. A molecule with n degrees of freedom has n² different ways of storing energy.

B. Each degree of freedom is associated with $\frac{1}{2}\mathrm{RT}$ average energy per mole.

C. A monoatomic gas molecule has 1 rotational degree of freedom where as diatomic molecule has 2 rotational degrees of freedom.

D. CH₄ has a total of 6 degrees of freedom

     Choose the correct answer from the option given below: