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Factorize a^4 + a^2b^2 + b^4.

A(a^2+ab+b^2)(a^2-ab+b^2)

B(a^2+b^2)^2

C(a+b)^2(a-b)^2

D(a^2+2ab+b^2)(a^2-2ab+b^2)