Which of the following is the factorization of x2−y2−4x+4x^2 - y^2 - 4x + 4x2−y2−4x+4?
(x−2+y)(x−2−y)(x - 2 + y)(x - 2 - y)(x−2+y)(x−2−y)
(x+2+y)(x+2−y)(x + 2 + y)(x + 2 - y)(x+2+y)(x+2−y)
(x−2)2−y2(x - 2)^2 - y^2(x−2)2−y2
(x−y)(x+y)−4(x−1)(x - y)(x + y) - 4(x - 1)(x−y)(x+y)−4(x−1)