Find the Center of the Sphere $x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 6 x + 4 y + 9 = 0$

Multiple Choice

Find the center of the sphere. $x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 6 x + 4 y + 9 = 0$

A) Center: $( 3 , - 2,0 )$
B) Center: $( - 3 , - 2,0 )$
C) Center: $( - 3,2,0 )$
D) Center: $( 0 , - 2,0 )$
E) Center: $( 3,0,0 )$