You are a physical therapist student who is studying the classes of levers in kinesiology. The instructor describes one class of lever in the following way: a common example is a seesaw, or in the body, the example would be the atlanto-occipital joint. With the information given above, which of the following is most likely the class of lever described?
A. First -class lever
B. Second-class lever
C. Third-class lever
D. Fourth-class lever