An AP calculus teacher has been teaching students about graph sketching and wants to check quickly that the students have grasped the main principles. She asks the students, "Please sketch the graph of y = 1/1 + x2." Each student sketches the graph on a whiteboard and holds it up for the teacher to see. The teacher sees that the class has understood and moves on. Which type of assessment is this? Group of answer choices Traditional assessment Formative assessment Standardized assessment Norm-referenced assessment