Can I please get help with this question?

3. In a case-control study, exposure status was misclassified as follows: Study Population without Misclassification Cases Controls Exposed 500 500 Unexposed 250 1,000 Study Population with Misclassification Cases Controls Exposed 250 250 Unexposed 500 1,250 a. What is the most appropriate relative measure of association to use in this study? b. Comparing the study population with and without misclassification using this measure of association, is there evidence of information bias? c. If there is evidence of information bias, is it differential or W? Explain why by comparing the errors in misclassification of exposure between the cases and controls. d. If there is information bias, is it towards or away from the null? Why