Consider the following data set Data = {1, 2, 4, 5, 7, 8, 9} Assume that we applied two different approaches to cluster this dataset. In the first approach, we clustered the dataset into 3 clusters as C1={1, 2}, C2={4, 5}, C3={7, 8, 9} In the second approach, we clustered the same dataset into 2 clusters as C1={1, 2, 4, 5}, C2={7, 8, 9} Calculate the Dunn index for each approach. Based on your calculations, which approach produces better clusters?