Which of the following is true about an invoice?

• A. It includes only the buyer's details.
• B. It must be issued before any goods or services are provided.
• C. It includes description, quantities, prices, totals, and payment terms.
• D. It does not require a unique invoice number.

Answer: (C)

An invoice is a document sent by the supplier to request payment for goods or services. It should be clear and detailed so the buyer can verify exactly what’s being charged. The essential elements include a description of what was supplied, the quantities, unit prices, line totals, and a final total. It also states payment terms—when payment is due and acceptable methods—so cash flow and expectations are clear. A unique invoice number (along with the date) is included for identification, tracking, and audit purposes. This is why the described option is correct: it covers the key content that makes an invoice informative and traceable. The other statements don’t fit because invoices typically include details of both parties, are often issued after delivery or completion rather than beforehand, and must have a unique invoice number to avoid confusion or duplication.