Retail Music, Inc., offers to buy from Super Products Corporation (SPC) 1,000 blank CDs of a certain brand. Without notifying Retail, SPC timely ships CDs of a different brand. This shipment isa.an acceptance of the offer and a breach of the parties' contract.b.an acceptance of the offer and a fulfillment of the parties' contract.c.a refusal of the offer and a fulfillment of the parties' contract.d.a refusal of the offer and a breach of the parties' contract