The community health center has observed a significant increase in influenza cases compared to previous years. The nursing staff is tasked with reviewing outcome data to identify any trends in vaccination rates and reasons for any decline. What actions should the nursing team take to gather data for analysis?

D Determine the change in immunization rates from the previous year to the current year. B Ask a set number of clients if they have had the flu. C Generate influenza immunization and case reports from the electronic record. A Delineate the geographic distribution of the area to survey and review for patterns.