9.

Which of the following statements is/are true? (5 points)

1. If f '(c) = 0, then f has a local maximum or minimum at x = c.
2. If f is continuous on [a, b] and differentiable on (a, b) and f '(x) = 0 on (a, b), then f is constant on [a, b].
3. The Mean Value Theorem can be applied to f(x) = 1/x²on the interval [-1, 1].

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I only

II only

I and III only

I and II only