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Which of the following are equivalent to $\cfrac{d}{dx} (3x^3)$?

I. $y'$ when $y=\cfrac{3}{2} \left( 2x^3-\cfrac{2}{3} \right)$. II. $\cfrac{dy}{dx}$ when $y-3x^3=15$. III. $f'(x)$ when $f(x)=(3x-2)^3$.

I. $y'$ when $y=\cfrac{3}{2} \left( 2x^3-\cfrac{2}{3} \right)$.

II. $\cfrac{dy}{dx}$ when $y-3x^3=15$.

III. $f'(x)$ when $f(x)=(3x-2)^3$.

I only.

I and II only.

I and III only.

I, II, and III.