a) What are the advantages of DBSCAN clustering algorithm? b) Assume, you want to cluster observations into 3 clusters using K-Means clustering algorithm. After first iteration three clusters (C1, C2, C3) have the following observations: C1: {(4,4), (5,5), (6,6)} C2: {(0,6), (4,6)} C3: {(3,9), (11,11)} Find the cluster centroid of each cluster? The course is DATA MINING 466