The Center and Radius of the Sphere $x ^ { 2 } + y ^ { 2 } + z ^ { 2 } + 2 x - 2 z = - 1$

Multiple Choice

The center and radius of the sphere $x ^ { 2 } + y ^ { 2 } + z ^ { 2 } + 2 x - 2 z = - 1$ are

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