Two point masses $$m_1$$ and $$m_2$$ are connected at the ends of a light rigid rod of length l. The moment of inertia of the system about an axis through their centre of mass and perpendicular to the rod is

A

$$\frac{1}{2}\frac{m_1 m_2}{m_1 + m_2}l^2$$

B

$$\frac{m_1  m_2}{m_1 + m_2}l^2$$

C

$$(m_1 + m_2)l^2$$

D

$$[m^{1}_1 + m^{2}_2]\frac{m_1 m_2}{2(m_1 + m_2)}l^2$$