The operating system serves as the interface between the user, applications, and hardware.

Case 1-1 As you prepare to bring one of the interns in your software development company to speed up the project on which you are working, you decide to create some illustrations of your programming to make certain key concepts clear to the intern. Which of the following do you show your intern as an example of an event that a user might perform in the application you are creating?

A. powering on the computer B. saving data to RAM C. clicking a button D. all of the above

Which item in the figure above is one of the non-destructive Liquify tools?

A. 5 B. 6 C. 8 D. 9