9. Sarah buys personal, household items from Amazon.com. If she uses a credit card from Amazon (as opposed to her credit card from her bank), and at the beginning of the next year, Amazon sends Sarah merchandise worth 3% of her purchases in the last year. The merchandise is: O d. Not gross income because it is like a rebate or discount. O c. Not gross income because it was received a year after the purchases 0 a. Gross income to Sarah O b. Not gross income because the merchandise is not money