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Factorize a^3 + b^3 + c^3 - 3abc.

A(a+b+c)(a^2+b^2+c^2-ab-bc-ca)

B(a+b+c)^3

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

D(a+b+c)(a^2+b^2+c^2+ab+bc+ca)