Argo Manufacturing Corp., an accrual basis corporation with a fiscal year ending September 30, has an agreement with Mark IV Wholesalers, Inc. whereby it manufactures and ships electronic products to Mark IV for distribution and ultimate sale during the December holiday season. Pursuant to the sales agreement, title to goods shipped passes to Mark IV when they are shipped by Argo. It is clearly understood, however, that Mark IV has a 15-day right to return any product it determines are not up to required specifications. (a) On September 21, 2022, Argo ships $15,000,000 of goods to Mark IV. When must Argo include the sales proceeds in its gross receipts? Fully explain your answer. (b) How would your answer change, if at all, if Mark IV returned $900,000 of the shipment on October 8, 2022? Fully explain your answer? (c) In order to insure deferral of future sales, Argo's CFO proposes that the sales agreement Argo uses for Mark IV be modified so as to give Mark IV thirty (30) days to specifically accept or reject the product, with title not passing to Mark IV until it does so. What issues, if any, do you see the Internal Revenue Service raising with respect to the CFO's plan