Organize the following sets of items into hierarchies of classes with typical attributes and methods (names only). Use UML or text as you prefer. Hints:

* Each set of items will have several hierarchies of inheritance.
* If using text, show inheritance with 'Child extends Parent'.
* You do not need to show attributes and methods inherited from a parent.
* Think of at least one key attribute for each class; answers will vary.
* Remember that instances of classes can be used as attributes.

a. Hotel Room, Guest, Conference, Room, Ballroom, Conference Room, Keynote Speaker
b. Schedule, Bus, Chartered Bus, Tour, Route, Tour Bus, Trip, Express Bus
c. Restaurant, Bill, Meal, Daily Special, Waitress, Customer, Drink, Price, Item