Chain Rule Definition and Application

I. The derivative of $\sin(2x+3)$ is $2\cos(2x+3)$.

II. The chain rule is unnecessary to find the derivative of $\sin(2x+3)$, as the result is simply $\cos(2x)+3$.

III. The chain rule states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function, multiplied by the derivative of the inner function.

Which of the statements above is or are true?