You are public health researcher explaining the importance of case selection, control selection, and sources of exposure information in case control studies. Your Zoom presentation focuses on examining the relationship between low physical activity and heart disease. After the presentation, you look through the chat and realize that your audience had several questions. You decide to post your response on your webpage to the questions for your audience to read. For the first three questions (a-c), please explain in words (qualitatively, no numbers) which cell(s) in a 2 x 2 table would change and in which direction (increase, decrease) and what effect that would have on the odds ratio. For the remaining two questions, make sure that you answer them fully.