Which of the following is the complete factorization of x2−y2+z2−w2+2xz−2yw?
(x−z−y−w)(x−z+y+w)
(x+z−y−w)(x+z+y+w)
(x+z+y+w)(x−z−y−w)
(x+z−y+w)(x+z+y−w)
