A researcher conducted a prospective cohort study 'om which all cases and a subset of controls (n=280) were selected for an incidence case-control study. Using the data below, determine whether the researcher used cumulative sampling, casecohort sampling, or another method for selecting controls. Provide an explanation for your response. Cohort Study Disease No Disease Total Exposed 162 408 570 Not exposed 1 18 422 540 Total 280 830 Case-Control Study Cases Controls Total Exposed 162 196 358 Not exposed 118 84 202 Total 280 280