If one sought to present utilitarianism through the work of three of its prominent 20th Century theorists, which ones would make the most sense in the context of a general overview of the literature on act utilitarianism, rule utilitarianism, and motive utilitarianism?
Three well-known 20th/21st Century Utilitarians:
R.M. Hare famous for defending a version of what is often considered rule utilitarianism. (Not to be confused with his son who is also a philosopher)