Considering a system having two masses `m_(1)` and `m_(2)` in which first mass is pushed towards centre of mass by a distance a, the distance required to be moved for second mass to keep centre of mass at same position is :-
A. `(m_(1))/(m_(2))a`
B. `(m_(1)m_(2))/(a)`
C. `(m_(2))/(m_(1))a`
D. `((m_(2)m_(1))/(m_(1) + m_(2)))a`