Find the Center and Radius of the Sphere $x ^ { 2 } + y ^ { 2 } + z ^ { 2 } + 6 x - 12 y - 6 z + 29 = 0$

Multiple Choice

Find the center and radius of the sphere. $x ^ { 2 } + y ^ { 2 } + z ^ { 2 } + 6 x - 12 y - 6 z + 29 = 0$

A) center: (3,-6,-3) ;radius: 25.
B) center: (-3,6,3) ;radius: 5
C) center: (3,-6,-3) ;radius: 25
D) center: (-3,-6,-3) ;radius: 5
E) center: (3,-6,-3) ;radius: 5