Why did dissenting Judge Rives disagree with the majority position in Campbell v. Tennessee Valley Authority? Question 2 options: a) It is doubtful whether the defendant was enriched or harmed by the plaintiff's actions. b) If the defendant was enriched by the actions of the plaintiff, it was not unjust. c) The action taken by the majority actually amounted to enforcing an express contract through quasi-contract. d) All of the above