A good answer might be:

• How many types of automobile are there in the diagram?
  • Two---the general type "Automobile" and a specific type, "Ford."
• How many automobiles are there in the diagram?
  • Three.

This picture shows a hierarchy of classes. It shows that "Ford is-a automobile," "Nissan is-a automobile," and that "VW is-a automobile." It also shows that "Sentra is-a Nissan."

In a hierarchy, each class has at most one parent, but might have several child classes. There is one class, at the "top" of the hierarchy that has no parent. This is sometimes called the root of the hierarchy.

QUESTION 5:

What is the parent class of the class Sentra?