Two fixed charges "A" and "B" of `5 mu C` each are separated by a distance of "6m" .C is the mid point of the line joining "A" and "B" .A charge Q of `-5 mu C` is shot perpendicular to the line joining "A" and "B" through "C" with a kinetic energy of "0.06" J. The charge 'Q' comes to rest at a point "D" .The distance "CD" is (a) 3m (b) `sqrt(3)m` (c) `3sqrt(3)m`(d) `4m`