So this is actually a situation where, like I just drawn it, where our slope is positive before we hit the critical point. It gets to zero, but then it starts becoming positive again. And so that's why you actually have to do this test in order to identify whether it's an extremum. It turns out that this is not an extremum. This is not a maximum or a minimum point here. So Pamela's work is not correct, and her mistake is step three. In order to make this conclusion, you would have to test on either side of that critical point, test the first derivative.