Which system is used to show colors from a video display?

The additive color system is the correct choice for showing colors from a video display because it involves combining different colors of light to create a broader spectrum of colors. In this system, the primary colors are red, green, and blue (RGB). When these colors are mixed together in various intensities, they produce a wide variety of colors and are the foundation of how monitors and screens operate, as they emit light directly.

In contrast, the subtractive color system, which typically involves dyes or pigments, works by absorbing certain wavelengths of light and reflecting others. This system is commonly used in printing but not applicable to video displays. The other options mentioned (the plus/minus color system and the recover color system) are not standard terms used in color theory or video technology, making them irrelevant to how colors are represented on a video display. Thus, the additive color system clearly stands out as the appropriate mechanism for displaying colors in video technology.