Which expression is equivalent to the difference of two squares 9n2−16m29n^2 - 16m^29n2−16m2?
(3n−4m)(3n−4m)(3n - 4m)(3n - 4m)(3n−4m)(3n−4m)
(3n+4m)(3n−4m)(3n + 4m)(3n - 4m)(3n+4m)(3n−4m)
(9n−16m)(n+m)(9n - 16m)(n + m)(9n−16m)(n+m)
(3n+4m)2(3n + 4m)^2(3n+4m)2