Which component is NOT part of the register?

The shopping cart is not considered a component of the register. The register is specifically a point of sale system designed to handle transactions, which includes various components like a monitor for displaying information and processing transactions, a conveyor for moving items to the checkout area or in some cases, helping with scanning items, and scales for weighing products that are sold by weight. The shopping cart, however, is simply a tool that customers use to collect their items while shopping, and it is not part of the actual transaction processing system at the register. Thus, it does not contribute to the functions of processing sales, tracking inventory, or managing customer payments, which are the primary roles of the components associated with a register.