C-03-Q031mediumsingle_mcqx2−9=?x^2 - 9 = ?x2−9=?a(x+3)(x−3)(x+3)(x-3)(x+3)(x−3)b(x−3)2(x-3)^2(x−3)2c(x+3)2(x+3)^2(x+3)2d(x+9)(x−1)(x+9)(x-1)(x+9)(x−1)