What Is/are the Purpose(s) of the External and Internal Intercostal

What is/are the purpose(s) of the external and internal intercostal muscles located in the thoracic and abdominal region of the body?

A) They provide lubrication to allow the lungs to slide along the thoracic cage with expiration and inspiration of the lungs.
B) The external intercostal muscles depress the rib cage; the internal intercostals muscles elevate the diaphragm.
C) The external intercostal muscles elevate the rib cage; the internal intercostals muscles depress the diaphragm.
D) The external intercostal muscles elevate the diaphragm; the internal intercostals muscles depress the rib cage.
E) The external intercostal muscles assist with expiration; the internal intercostals muscles assist with inspiration.