Concept:A credit note is a commercial document issued by a seller to correct a mistake in an already issued invoice, such as an overcharge.
Explanation:When a buyer discovers an error on an invoice, the seller verifies the mistake and issues a credit note.
This note reduces the amount owed by the buyer or adjusts the total shown on the original invoice.
The credit note clearly states the corrected amount and serves as proof that the seller acknowledges the error.
Advice notes, consignment notes, and delivery notes are used for dispatching or receiving goods, not for correcting financial amounts.
Only a credit note is specifically designed to rectify an invoice error by granting a credit to the customer.
Thus, the proper way to correct an invoice error is to issue a credit note.
Answer:C. a credit note