Multiply and simplify: (3x+2)(3x−2)(3x + 2)(3x - 2)(3x+2)(3x−2).
9x2−49x^2 - 49x2−4
9x2+49x^2 + 49x2+4
6x2−46x^2 - 46x2−4
9x2−12x−49x^2 - 12x - 49x2−12x−4