Well, as we approach from the right, this one right over here is, f of x is equal to six x minus nine. So we just write six x minus nine. And once again, six x minus nine is defined and continuous for all real numbers, so we can just pop a three in there, and you get 18 minus nine. 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.