What is the completely factored form of x squared minus 16 x y plus 64 y squared ?
A
open paren x plus 8 y close paren times open paren x plus 8 y close parenB
x y open paren x minus 16 plus 64 y close parenC
x y open paren x plus 16 plus 64 y close parenD
open paren x minus 8 y close paren times open paren x minus 8 y close paren