Not enough info or inconclusive. And like always, pause the video and see if you can figure it out. Well, we're assuming it's twice-differentiable. I think it's safe to assume that it's, and we'll, for the sake of this problem, we're gonna assume that the derivative exists in a neighborhood around x equals eight. So this example, c is eight, so the point eight five is definitely on the curve. The derivative is equal to zero, so we're dealing potentially with one of these scenarios. And our second derivative is less than zero.