Consider the technique for identifying the optimal number of aggregations (clusters) of categorical levels using PROC CLUSTER. Which of the following statements is true? a. The optimal number of clusters is determined by the "knee rule".
b. The technique explicitly uses information on the variable which would be the target in a predictive modeling analysis.
c. The technique automatically creates the dummy variables representing the optimal number of clusters.
d. The technique uses the same clustering algorithm used by Tableau to create clusters.
e. All are true