And we see right over here at x equals negative three, our graph is not continuous. So x equals negative three, it's not continuous. And those are the only places where f is not differentiable that they're giving us options on. We don't know what the graph is doing to the left or the right. These I guess would be interesting cases, but they haven't given us those choices here. And we already said at x equals zero, the derivative is zero. It's defined, it's differentiable there.