4. In the definition of the CatchBird method in the Dog class, a custom exception is thrown. What is the name of that custom exception? What class does the custom exception inherit from? TiredAnimalException .........

5. PetRabbitsShouldRunSlower is not a unit test, but WildRabbitsShouldRunFaster is. The code is almost identical - what makes it a unit test?

6. The definition of the Cat class is public class Cat : Mammal, ILitterTrained, IBirdHunter. Is this multiple inheritance? Why or why not?