Are the following statements true or false?

a. Hierarchical and nonhierarchical clustering methods always produce different results.

b. One should always standardize data before performing cluster analysis.

c. Small distance coefficients in the agglomeration schedule imply that dissimilar cases are being merged.

d. It does not matter which distance measure you use; the clustering solutions are essentially similar.

e. It is advisable to analyze the same data set using different clustering procedures.