A Simple Rule to Follow When Creating Problem Domain Classes

Multiple Choice

A simple rule to follow when creating problem domain classes and data access and manipulation classes is that there should be ______________.

A) One data access and manipulation class for each concrete problem domain class
B) Two data access and manipulation classes for each concrete problem domain class
C) N data access and manipulation classes for each concrete problem domain class, where N is the number of methods in the problem domain class
D) N data access and manipulation classes for each concrete problem domain class, where N is the number of subclasses of the problem domain class
E) none of these