Well, that's exactly what we were just talking about. If the second derivative changes signs, in this case, it goes from negative to positive, that means our first derivative went from decreasing to increasing, which is indeed good for saying this is a calculus-based justification. So at least for now, I'm gonna put, kudos, you are correct there. It crosses the x-axis. So this is ambiguous. What is crossing the x-axis? If a student wrote this, I'd say, well, are they talking about the function?