Molecules of an ideal gas are known to have three translational degrees of freedom and two rotational degrees of freedom. The gas is maintained at a temperature of T. The total internal energy, $U$ of a mole of this gas, and the value of $\gamma\left(=\frac{C_p}{C_v}\right)$ are given, respectively, by
Select the correct option:
A
$\mathrm{U}=5 \mathrm{RT}$ and $\gamma=\frac{7}{5}$
B
$\mathrm{U}=\frac{5}{2} \mathrm{RT}$ and $\gamma=\frac{6}{5}$
C
$\mathrm{U}=5 \mathrm{RT}$ and $\gamma=\frac{6}{5}$
D
$\mathrm{U}=\frac{5}{2} \mathrm{RT}$ and $\gamma=\frac{7}{5}$
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