Your manager would like to learn the possible driver segments of the in$-$vehicle coupon promotion. Answer the following questions to help with the analysis.

Question $2$a: Discuss whether hierarchical clustering would be a suitable technique to find the possible driver segments. If your answer is no$,$suggest an alternative technique and explain its suitability for solving this problem.

Question $2$b: Compare and evaluate the performance results of the two constructed clustering models $($given in the Appendix$)$using various evaluation measures. Discuss which one is better.