Two stars of masses `m_(1)` and `m_(2)` distance r apart, revolve about their centre of mass. The period of revolution is :

Two stars of masses `m_(1)` and `m_(2)` distance r apart, revolve about their centre of mass. The period of revolution is :
A. `2pisqrt(r^3/(2G(m_1+m_2)))`
B. `2pisqrt((r^3(m_1+m_2))/(2G(m_1m_2)))`
C. `2pisqrt((2r^3)/(G(m_1+m_2)))`
D. `2pisqrt((r^3)/(G(m_1+m_2)))`

Two stars of masses `m_(1)` and `m_(2)` distance r apart, revolve about their centre of mass. The period of revolution is :

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