I. For $$\int (4*x^2+8*x) dx$$, the antiderivative is given by $$\frac{4*x^3}{3}+ 4*x^2+ C$$.

II. Differentiating $$\frac{4*x^3}{3}+ 4*x^2+ C$$ returns the original function $$4*x^2+8*x$$.

III. The expression $$4*x^2+8*x$$ can be factored as $$4*x*(x+2)$$, and by applying an appropriate substitution on this factored form, one can derive an antiderivative that differs only by an arbitrary constant.

Which of the statements concerning the integration of $$4*x^2+8*x$$ are accurate?