Which of the Following Statements Describes a Cohort Study? (Select

Which of the following statements describes a cohort study? (Select all that apply)

A) determines risk factors for disease outcomes for a group of people by comparing cases and controls
B) over a period of time a group of people are followed to evaluate risk factors for disease outcomes
C) evaluates two similar groups in which one is exposed to a risk factor and the other isn't
D) evaluates whether people who have a disease were more or less likely to have been exposed to potential diseases-causing factors than people who don't have the disease