Sales for the past 12 months at Bell inc are given below January 10 February 12 March 14 April 16 may 18 June 23 July 26 August 31 September 27 October 18 November 16 December 14 A. Using a three-month moving average to forecast the sales for the months May through December B. Use a four-month moving average to forecast the sales for the months May through December C. Compare the performance of the two methods by using the bias and MAD as the performance criterion. Which method do you recommend?