Given the following supply chain made up of a supplier and a buyer, how does a buy-back contract help to share risk? Group of answer choices The supplier can ship exactly its optimal order quantity to the retailer. The buyer can ship unsold product back to the supplier for a buy-back price. The buyer can reduce the wholesale price so that the supplier will have a lower optimal order quantity. The supplier will ship to the buyer as needed. None of the statements illustrate how a buy-back contract helps to share risk