Who is classified as an unpaid seller?

An unpaid seller is defined as a seller who has delivered goods to a buyer but has not received payment for those goods. This classification is essential in business law as it establishes the seller's rights and remedies in relation to the transaction. When a seller has not been paid, they remain an unpaid seller and may have the ability to enforce certain rights, such as refusing to deliver future goods or reclaiming goods that have not been paid for.

The other options do not meet the criteria for being classified as an unpaid seller. If a seller has received full payment for goods, they would not be considered an unpaid seller, as they have fulfilled their part of the transaction. A seller who no longer has the goods does not necessarily imply they are unpaid; they may have sold goods to a buyer and received payment. Lastly, a seller who has canceled the sale agreement does not fit the definition of an unpaid seller either, as the transaction may not have been completed and thus there wouldn't have been any expectation of payment. Thus, the correct answer accurately represents the situation of a seller who lacks payment for the delivered goods.