A first-year high school math teacher observes an experienced teacher. This experienced teacher is known for encouraging mathematics exploration by engaging students through active class discussions and mathematics modeling. Which of the following observations is indicative of students actively engaged in mathematics discussions and modeling? Group of answer choices The teacher is working one-on-one with students and canvassing the classroom while students engage in a task. The teacher is questioning and validating the answers of students who are on task. The students are working in separate groups on different parts of the same topic and then presenting information to the entire class. The students are observing while the teacher explores a topic and reaching conclusions based on their prior knowledge