The Center and Radius of the Sphere $x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 4 x = 0$

Multiple Choice

The center and radius of the sphere $x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 4 x = 0$ are

A) $( - 2,0,0 ) ; 2$
B) $( 2,0,0 ) ; 2$
C) $( - 2,0,0 ) ; 1$
D) $( 2,0,0 ) ; 4$
E) $( - 2,0,0 ) ; 4$