Final answer:
To void a previously scanned item, you usually hit the 'Void' button, then scan or select the specific item to remove it, which is typically option (a) in point of sale systems.
Step-by-step explanation:
To void an item that wasn't the last one scanned, you typically need to follow a process that allows you to select that specific item from a list of scanned items. While the exact method can depend on the point of sale system being used, the general process would involve selecting the item from the transaction list and then choosing the option to void it. In most cases, this would be option (a): Hit the "Void" button, then scan or select the item you wish to remove from the transaction. This action cancels the selected item without canceling the entire transaction. It's important to perform voids carefully to ensure accuracy in the transaction and inventory records.