1. (17 points) A study of ozone exposure and asthma conducted at the University of Southern California states that \"3535 children with no history of asthma were recruited from schools in 12 communities in southern California and were followed up for 5 years.\" (a) Is this a case-control, cohort, or cross-sectional study? (b) Suppose the researchers want to compare the likelihood of developing asthma for children who live in high-ozone areas vs. low-ozone areas. Can they estimate relative risks from this study, or is this type of study incompatible with the estimation of relative risks? (c) Can they estimate odds ratios, or are odds ratios incompatible with this type of study