Create an ItemSold class for Francis Pet Supply. Fields include an invoice number, description, and price. Create get and set methods for each field. Create a subclass named PetSold that descends from ItemSold and includes three Boolean fields that indicate whether the pet has been vaccinated, neutered, and housebroken, and include get and set methods for these fields. Write an application that creates two objects of each class, and demonstrate that all the methods work correctly. Save the files as ItemSold.java, PetSold.java, and DemoItemsAndPets.java.