Which of the following is equivalent to (x−y)(x+y)(x2+y2)(x-y)(x+y)(x^2+y^2)(x−y)(x+y)(x2+y2)?
x4−y4x^4 - y^4x4−y4
x4+y4x^4 + y^4x4+y4
(x−y)4(x-y)^4(x−y)4
x2−y2x^2 - y^2x2−y2