Which statements are correct about degrees of freedom?

A. A molecule with $n$ degrees of freedom has $n^2$ different ways of storing energy.

B. Each degree of freedom is associated with $\frac{1}{2}RT$ 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. ${\mathrm{CH}}_4$ has a total to $6$ degrees of freedom.

Choose the correct answer from the option given below:

• A

  $\mathrm{B}$ and $\mathrm{C}$ only
• Correct answer
  B

  $\mathrm{B}$ and $\mathrm{D}$ only
• C

  $\mathrm{A}$ and $\mathrm{B}$ only
• D

  $\mathrm{C}$ and $\mathrm{D}$ only

Hence, the correct answer is option: 'B'.