7 Rewrite the equation in standard form of a circle and state the center and radius x y 8x 4y 16 0 A x 4 2 y 2 4 center is 4 2 and radius is 4 B x 8 2 y 4 4 center is 8 4 and radius is 4 C x 8 y 4 4 center is 8 4 and radius is 2 D x 4 y 2 4 center is 4 2 and radius is 2