Which of the following items must be scanned when processing a return?

When processing a return, it is essential to scan all returned items, including exchanges, for accurate inventory management and record-keeping. Scanning each item ensures that the system reflects current stock levels and helps track which products are frequently returned, providing valuable data for future sales strategies and inventory decisions. It also facilitates a smoother transaction process for customers, as every item involved in the return is accounted for in the system. This practice supports effective customer service and adherence to company policies regarding returns, making option C the most appropriate choice for this question.