Which expression is a factor of x3−3x2+3x−1x^3 - 3x^2 + 3x - 1x3−3x2+3x−1?
(x−1)(x - 1)(x−1)
(x+1)(x + 1)(x+1)
(x−2)(x - 2)(x−2)
(x2+1)(x^2 + 1)(x2+1)