A 52-year-old male presents to clinic with complaints of neck pain. He says the pain has been ongoing for about 3 months ever since he has been sleeping on his new mattress. Osteopathic structural examination reveals the patient has tightness and tenderness to palpation on the left cervical paraspinal musculature. Further examination exhibits the patient’s 1st and 2nd rib on the left have decreased movement during exhalation when compared to the right. Which of the following sets correctly describes the key rib?