10 points
4. An expression is shown. Which is equivalent to this expression? *
4x^4- 16x^2

A. 0 (4x - 2)(x + 2)
B. 4x2(x - 2)(x + 2)
C. x2(x - 4)(x + 4)
D. 4(x2 - 2)(x2 + 2)