Which of the following data sets alone cannot be used to successfully calibrate an advertising response model such as an ADBUDG model? Select one: a. Daily store purchase data from the past 3 years, with purchase dates, purchase locations, and products purchased at the SKU (Stock Keeping Unit) level b. Management team's insights into how the sales might change if the advertising investment changes in the next period Oc. Monthly aggregated sales data and advertising investment records in the past 18 months d. All of the listed data sets can be used alone to successfully calibrate an advertising response model