Are the following statements true or false?

a. Clusters of consumers can be created based on different characteristics.

b. The cluster centroid is used as the starting point in nonhierarchical clustering from which clusters are built.

c. The length of time between two objects indicates the degree of similarity between them.

d. A sequential threshold is where several cluster centers are selected simultaneously and objects within the threshold level are grouped with the nearest center.

e. Cluster membership indicates the cluster that each case belongs to and the distance from the case to the center in nonhierarchical clustering.