The graph of the function F(x) is shown below. Use the letters shown on the graph to answer the following guestions. di f X g ) Find the value(s) of x where F'(x) = 0. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) Be sure that you use lowercase letters in your answer. b) Where is F'(x) > 0 ? (Use interval notation. If an answer does not exist, enter DNE.) Be sure that you use lowercase letters in your answer.