So based on our definition of a critical point, x sub 3 would also be a critical point. But it does not appear to be a minimum or a maximum point. So a minimum or a maximum point, that's not an endpoint. It's definitely going to be a critical point. But being a critical point by itself does not mean you're at a minimum or maximum point. So just to be clear, at all of these points, we're at a minimum or maximum point. This, we're at a critical point.