The University of Dover and Dover University are bitter cross town rivals. They compete in everything from sports to academics. The schools, because of shrinking enrollment, make an agreement to give all incoming students free tuition for one semester before raising the existing rates the following semester. This action would be considered:______.a) a horizontal restraint violating the Sherman Act.b) a vertical restraint violating the Sherman Act.c) a tying agreement in violation of the Clayton Act.d) price discrimination in violation of the Robinson-Patman Act.