Which of the Following Is the Correct Definition of the Term

Which of the following is the correct definition of the term: 'resale price maintenance'?

A) The supplier of goods recommends a price at which the retailer may sell their goods or services.
B) The retailer of goods tries to impose a minimum price below which they will not purchase the goods from the supplier.
C) The supplier of goods tries to impose a minimum price below which their goods or services are not to be sold.
D) An agreement between the supplier and retailer that the goods will not be supplied to competitors of the retailer.