The Center and Radius of the Sphere Whose Endpoints of a Diameter

Multiple Choice

The center and radius of the sphere whose endpoints of a diameter (-2, 0, 4) and (2,6,8) are

A) $( 0 , - 3 , - 6 ) ; 4$
B) $( 0 , - 3,6 ) ; \sqrt { 17 }$
C) $( 0,3 , - 6 ) ; \sqrt { 17 }$
D) $( 0,3,6 ) ; \sqrt { 17 }$
E) $( 0,3,6 ) ; 4$