Reverse video is a technique of

The correct answer is: D. emphasizing data by reversing the foreground and background.

Reverse video is a technique of displaying text or images on a computer screen by reversing the foreground and background colors. This can be used to emphasize certain data or to make it more difficult to read.

Option A is incorrect because reverse video does not show data with half brightness.

Option B is incorrect because reverse video does not show data upside down on the screen.

Option C is incorrect because reverse video does not hide confidential data on the screen.

Option E is incorrect because reverse video is a real technique that is used for a variety of purposes.