PLEASE PLEASE HELP ME PLEASE I REALLY REALLY NEED THIS DONE ASAP Based on the graph and information given, choose the correct answer below.

a.) f’ is not defined at x = 0, x = 1 and x = 6 because at these points the graph has cusps

b.) f’ is not defined at x = -2, x = 1 and x = 4 because at these points the graph has cusps

c.) f’ is not defined at x = 0, x = 1 and x = 4 because at these points the graph has corners

d.) f’ is not defined at x = -2, x = 1 and x = 4 because at these points the graph has corners