Write the product (4x−7)(4x+7)(4x - 7)(4x + 7)(4x−7)(4x+7) in simplified form.
16x2+4916x^2 + 4916x2+49
16x2−56x−4916x^2 - 56x - 4916x2−56x−49
16x2−4916x^2 - 4916x2−49
8x2−498x^2 - 498x2−49