The data below represent the call volumes over 16 quarters from a call center at a major financial institution. Develop a forecasting model for the volume of calls (in 000 units). 2010 473 2011 544 2012 628 2013 709 Q1 513 725 Q2 Q3 582 681 707 773 582 854 Q4 474 557 592 661 Volume of Calls to Call Center 2010 to 2013 900 800 700 600 500 400 -Actual Volume of Calls y = 18.207x + 473.68 300 Deseasonalized Actual 200 -Linear (Actual Volume of Calls) 100 0 1 2 2 3 4 5 6 7 8 9 10 12 13 14 15 16 11 3 1 2 3 4 1 2 3 4 1 2 4 1 2 3 4 2010 2011 2012 2013 Looking at the linear trend of volume of calls to the center over the 4-year period, identify which of the following tatements is the most accurate. Select one: a. On average the volume of calls is decreasing by 18,207 each year O b. On average the volume of calls is increasing by 18,207 each quarter Oc. On average the volume of calls is increasing by 473.68 each quarter d. On average the volume of calls is decreasing by 473.68 each quarter e. On average, the volume of calls remains constant Of. None of the above