Concept:A credit note is a commercial document used to correct mistakes made on an original invoice.
Explanation:An invoice is issued by a seller to record a sale.
If an error is discovered on that invoice, the seller cannot simply alter the original document.
Instead, the seller issues a credit note to the buyer.
This credit note reduces the amount owed by the buyer or cancels the incorrect charge.
It clearly shows the corrected amount and the reason for the adjustment, such as a pricing mistake, wrong quantity, or damaged goods.
Among the given documents, only a credit note serves this correction purpose.
An advice note, consignment note, and delivery note are related to dispatch and delivery, not to financial corrections.
Answer:B. A credit note