That would still be a relative minimum, but if it was positive at that point, then you would be concave upwards, which would mean that at x equals negative four, your original function wouldn't have a maximum point. It would have a minimum point. And so just a relative minimum isn't enough. In order to know that you are dealing with a relative maximum, you would have to know that the second derivative is negative there. Now this fourth choice, H prime prime is concave up. It does indeed look like the second derivative is concave up but that by itself does not justify that the original function is concave up. For example, well, I could use this example right here.