Refer to the exhibit.
You are using K-means clustering to classify customer behavior for a large retailer. You need to determine the optimum number of customer groups.
You plot the within-sum-of-squares (wss) data as shown in the exhibit. How many customer groups should you specify?
A. 2
B. 3
C. 4
D. 8
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As there is no substantial reduction in wss after 3, should it be the answer?