Which of the following would promote proper implementation of demand plans and reduce demand variability?
I. Altering the date of the preliminary sales and operations planning (S&OP) meeting to match when data are available
II. Basing trend projections on as many extrinsic leading indicators of change as possible
III. Using key drivers of change as a sanity check on forecasts
IV. Using last year's sales data as a sanity check on this year's forecasts
a. II and III
b. I, II, and III
c. I, III, and IV
d. I, II, III, and IV