Z plc has found that it can estimate future sales using time series analysis and regression techniques. The following trend equation has been derived: y=25,000+ 6,500x where: y is the total sales units per quarter x is the time period reference number Using the above model, what is the forecast for sales units for the third quarter of year 7, assuming that the first quarter of year 1 is time period reference number 1? a. 207,000 units O b. 194,000 units c. 200,500 units O d. 213,500 units