The algebraic expression $$(a+b+ab+2)^2+(a-ab+2-b)^2-2b^2(1+a^2)$$ reduces to

A

$$4(a+2)^2$$

B

$$2(a+2)^2+4ab^2$$

C

$$(a-2)^2$$

D

$$2(a-2)^2+4ab^2$$