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A smooth massless string passes over a s...

A smooth massless string passes over a smooth fixed pulley. Two masses `m_1 and m_2 (m_1 > m_2)` are tied at the two ends of the string. The masses are allowed to move under gravity starting from rest. The total external force acting on the two masses is

A

`(m_1 + m_2)g`

B

`((m_1 - m_2)^2)/(m_1 + m_2) g`

C

`(m_1 + m_2)g`

D

`((m_1 + m_2)^2)/(m_1 - m_2) g`

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