If one of the diameters of the circle $x ^ { 2 } + y ^ { 2 } - 10 x + 4 y + 13 = 0$ is a chord of another circle $C$, whose center is the point of intersection of the lines $2 x + 3 y = 12$ and $3 x - 2 y = 5$, then the radius of the circle $C$ is\\
(1) $\sqrt { 20 }$\\
(2) 4\\
(3) 6\\
(4) $3 \sqrt { 2 }$