Find the Center and Radius of the Sphere $$x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 18 x - 10 y - 6 z = - 15$$

Multiple Choice

Find the center and radius of the sphere.
- $$x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 18 x - 10 y - 6 z = - 15$$

A) C(9, 5, 3) , a = 100
B) C(-9, -5, -3) , a = 10
C) C(-9, -5, -3) , a = 100
D) C(9, 5, 3) , a = 10