On July 10, Pet Supply Store orders fifty small dog collars from Quality Collars, Inc. to be delivered by July 15. On July 13, Quality Collars tenders fifty large dog collars. Pet Supply rejects the shipment. Quality Collars has
a. until July 15 to cure
b. no right to cure
c. until the end of the business day on July 13 to cure
d. unlimited time to cure