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What is the completely factored form of d^4 - 8d^2 + 16?.
A) (d^2 + 4)(d^2 - 4).
B) (d^2 - 4)(d^2 - 4).
C) (d^2 + 4)(d + 2)(d - 2).
D) (d + 2)(d - 2)(d + 2)(d - 2)
