* Consider the graph to the right. Explain the idea of a critical value. Then determine which x-values are 3' ' critical values, and state why. X1 X2 X3 X4 X, X617X8X9 X10 X v Which x-values are critical values? 0 A. All x-values are critical values because they all occur at relative extrema or where the slopes of the tangent lines do not exist. 0 B. x1, x3, x5, x6, x3, and x10 because relative extrema occur at these points. 0 C. x1, x3, x4, x5, x6, x7, X3, and x10 because the slopes of the tangent lines at these points 4} 0 or do not occur. 0 D. x4 and x7 because a comer exists at these x-values