In a regression model the diagnostics show that the residuals are not normal and do not have constant variance. Which of the following is the best procedure to follow? Select one:
a. Attempt to address both the equal variance and normality issues simultaneously.
b. Take steps to address the unequal variance, as this is the more critical assumption.
c. Remove variables from the model untill the model assumptions are satisfied.
d. The model is totally inappropriate, and nothing can be done to fix it.