Which of the following statements are true about graphs of polynomial functions? Check all that apply.

At a local maximum or minimum, the graph changes direction, so the extremum occurs at a turning point; statement A is true. A local maximum is the y-value at the point, not its x-value, so B is false. For an even-degree polynomial, both ends of the graph go in the same direction: they approach either positive infinity or negative infinity, making C true.

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