Is ArrayList a subclass of ArrayList?

An event driven interactivity chart:

a. Is not important to the development of the project. b. Should only be used if the project has very complicated interaction. c. Should always be developed to show how the screens interact with each other. d. Is only used by the user after the project is completed.

You can tell which scene is currently displayed by the scene number in the ____ corner of the Stage window.

A. upper-right B. lower-left C. upper-left D. lower-right