Use the following information to answer the next question. The graph of a sinusoidal function is shown below. The points A, B. C, D, and E are labelled. 11. a. Mary says that in order to find the period of the function, she would need to know the coordinates of point A and E. Bill says that he could find the period using the coordinates of B and D. Both Mary and Bill are correct. Explain why Mary is correct and explain why Bill is correct. (2 marks) b. Select all the points that represent the x-intercepts of the function. (1 mark)] c. Select all the points that represent the minimum value of the function. (1 mark) d. Select two points that could be used to determine the amplitude of the function. Explain a process that could be used to determine the amplitude using the two selected points. (2 marks)