Which Android KitKat Feature Is Described by the Following: "The

Which Android KitKat feature is described by the following: "The status bar at the top of the screen and the menu buttons at the bottom can be hidden, allowing your apps to fill more of the screen. Users can access the status bar by swiping down from the top of the screen, and the system bar (with the back button, home button and recent apps button) by swiping up from the bottom."

A) full-screen mode.
B) immersive mode.
C) immersion mode.
D) None of the above.