Unsupervised Evaluation Can Be Internal or External

Multiple Choice

Unsupervised evaluation can be internal or external. Which of the following is an internal method for evaluating alternative clusterings produced by the K-Means algorithm?

A) Use a production rule generator to compare the rule sets generated for each clustering.
B) Compute and compare class resemblance scores for the clusters formed by each clustering.
C) Compare the sum of squared error differences between instances and their corresponding cluster centers for each alternative clustering.
D) Create and compare the decision trees determined by each alternative clustering.