Which of the following is true concerning the hierarchical agglomerative clustering? then explain why the answer is correct and why others are false.

A)Hierarchical clustering is an iterative procedure that assigns customers to a predetermined number of clusters.

B)Hierarchical clustering requires that the data analyst decide on the number of clusters before employing the clustering method.

C)Several alternative solutions can be extracted from a complete dendrogram of customer data.

D)None of the above.