Which of the following is NOT one of the three unrelated business income activity categories? 1) The organization must be conducting a trade or business, including activities (even if unprofitable) carried on for the production of income from selling goods or performing services. 2) An activity carried on by an IRC 501 (c) 3 entity or by a governmental college or university, primarily for the convenience of its members, students, patients, officers or employees. 3) The trade or business must be regularly carried on (that is, the activity's frequency, continuity and manner of conduct are comparable to the commercial operations of similar for-profit entities). 4) The activity is not substantially related to the organization's exempt purpose. This means the activity does not contribute importantly to the exempt purposes.