Concept:An overcast invoice means the amount charged to the customer is more than it should be.Explanation:When a supplier overstates the value on an invoice, the customer has been overcharged.To correct this mistake, the supplier sends a document that reduces the amount owed by the customer.This document is called a credit note.It informs the customer that their account has been credited with the excess amount.Therefore, the correct option is a credit note.Answer:D. Credit note