Ecks sells goods to Wei on credit. Ecks then transfers the correct right to receive payments to See for cash. Meanwhile, Wei renders services to Aye, who agrees to pay the debt Wei originally owed to Ecks. All parties have notice of these transactions. Which of the following is true?

a. The Ecks-Wei transaction is an assignment.

b. The Ecks-See transaction is a delegation.

c. The Wei-Aye transaction is a delegation.

d. The Wei-Aye transaction is an a assignment.