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Factorize a^4 + 2a^2b^2 + 9b^4.

A(a^2+2ab+3b^2)(a^2-2ab+3b^2)

B(a^2+3b^2)^2

C(a^2-3b^2)^2

D(a^2+4ab+3b^2)(a^2-4ab+3b^2)