An Important Difference Between Categorization Via Exemplars and Categorization Via

An important difference between categorization via exemplars and categorization via prototypes is that according to exemplar theory:

A) the standard used in a particular category can vary from one occasion to the next
B) one categorizes objects by comparing them to a mentally represented standard
C) categorization depends on a judgment of resemblance
D) categories are represented in the mind by a relatively concrete illustration of the category