Use the Salaries data set in the carData package. The dependent variable (rank) is categorical with three levels (AsstProf, AssocProf, and Prof). Use all available independent variables. Use set.seed(123). Use the caret package to perform mixture discriminant analysis (MDA) with 5-fold cross validation. What is the cross validated accuracy? Answers: a. 0.1257 b. 0.4429 c. 0.8715 d. 0.5147 e. 0.2569