Well, this is also equal to nine. So the right and left-hand, the left and right-hand limits both equal nine, which is equal to the value of the function there, so it is definitely continuous. So we can rule out, we can rule out this choice right over there. And now let's think about differentiability. So in order to be differentiable, I'll just, differentiable, in order to be differentiable, the limit as x approaches three of f of x minus f of three over x minus three needs to exist. So let's see if we can evaluate this. So first of all, we know what f of three is.