A cohort study is conducted to evaluate the relationship between dietary calcium supplementation and the occurrence of hip fracture in post-menopausal women. A total of 1000 women who are taking calcium supplements and 1000 women who are not taking the supplements are followed over 3 years. During the follow-up period, there are 50 women with hip fractures in the calcium group and 100 women with hip fractures in the group not taking calcium. I. What kind of study design is this? (1 point) II. What are the exposure and outcome of this study? (2 points) III. What is the cumulative incidence of hip fractures in the calcium group? (2 points) IV. What is the cumulative incidence of hip fractures in the group not taking calcium supplements? (2 points) V. List the major assumption for the measure of morbidity in parts III and IV. (2 points)