Answer
a. All points.
b. No points.
c. No points.
Work Step by Step
a. Examine the graph given by the Exercise; we can find that all the points in the interval of the function are differentiable.
b. Examine the graph given by the Exercise; we can find that no points in the interval of the function are continuous but not differentiable.
c. Examine the graph given by the Exercise; we can find that no points in the interval of the function are neither continuous nor differentiable.
