Neuro Pharmaceuticals makes and sells a drug that prevents seizures. When the drug is no longer subject to a patent, Genero Drugs, Inc. gets ready to make and sell the generic form of the drug. Neuro pays Genero NOT to sell its product. This is most likely which of the following:

a.a per se violation of the Sherman Act.

b.a deal that neither restrains trade or harms competition.

c.subject to analysis under the rule of reason