Pepsinogen is produced by __________ and is activated by _________ which is secreted by ________.

chief cells; carbonic anhydrase (CAH); parietal cells

chief cells; hydrochloric acid (HCI); parietal cells

parietal cells; hydrochloric acid (HCI): chief cells

parietal cells; carbonic anhydrase (CAH); chief cells

enteroendocrine cells; carbonic anhydrase (CAH); parietal cells