System refers to several constituent elements (elements, parts) that are interrelated, restricted and dependent, combined in a certain order and form an organic whole with a specific function in a certain environment. Which of the following are not part of the system? ['The system of various organs of the human body.', 'Collaborative system of various institutions in the school.', 'Probability of the cup being bought.', 'Interaction of political subject with object and environment.']