A diatomic molecule is made of two masses $$m_1$$ and $$m_2$$ which are separated by a distance $$r$$. If we calculate its rotational energy by applying Bohr's rule of angular momentum quantization, its energy will be given by ($$n$$ is an integer)

A

$$\frac{(m_1+m_2)^2 n^2 h^2}{2 m_1^2 m_2^2 r^2}$$

B

$$\frac{n^2 h^2}{2(m_1+m_2)r^2}$$

C

$$\frac{2 n^2 h^2}{(m_1+m_2)r^2}$$

D

$$\frac{(m_1+m_2) n^2 h^2}{2 m_1 m_2 r^2}$$