When all variables are included the odds ratio for graduating when living on campus versus living off campus are no longer statistically significant at 0.05. This means Select one: 0 a. All are correct. 0 b. A confounding factor may be present in the model. 0 c. The factors that are not statistically significant must be removed from the model. 0 d. I should use a simple model with only Oncampus living since it will increase the chance for graduation