Continuous, not differentiable, differentiable, not continuous, both continuous and differentiable, neither continuous nor differentiable. Now one of these we can knock out right from the get-go. You cannot, in order to be differentiable, you need to be continuous there, so you cannot have differentiable but not continuous, so let's just rule that one out. And now let's think about continuity. So let's first think about continuity. And frankly, if it isn't continuous, then it's not going to be differentiable. So let's think about it a little bit.