If f(x) = 3x2 + 6x + 12 and g(x) = x2 – 6x + 3, what is f(x) + g(x)?

A. 2x^2 - 12x - 15

B. 4x^2 + 12x + 15

C. 4x^2 + 15

D. 2x^2 + 12x + 15

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