Consider the TopUniversities dataset used in class, which has 25 records. The dendrogram below is generated by the single linkage algorithm in Weka based on the dataset. The subsequent two screens show the k-means clustering results using Weka, where k = 4 and the clusters are labeled from cluster 0 to cluster 3. Answer questions (a), (b) and (c) following the screens.

c. Which method, single linkage (with dendrogram) or k-means, is better for clustering this dataset? Explain the reason in one or two sentences