Need help on D

please use R

2. In this question, we are going to perform cross-validation methods to determine the tuning parameter K for KNN. Consider Default data set, where we want to predict default using student, balance, and income predictors. Since student is a qualitative predictor, we want to use dummy variable for it and standardize the data using scale function. To load the Default data set and standardize the data, use the following command lines. library (ISLR) data("Default") X