In the U.S. Supreme Court case, Impression Products, Inc. v. Lexmark Int'l, Inc., the Court held that, "We conclude that a patentee's decision to sell a product exhausts all of its patent rights in that item, regardless of any restrictions the patentee purports to impose or the location of the sale." According to this case holding, which of the following types of exhaustion doctrines is emphasized in this case and the U.S. Patent Act?