Which of the following are the primary colours of light ?

Which of the following are the primary colours of light ?

Yellow, Red and Green
Blue, Red and Green
Violet, Red and Yellow
Indigo, Violet and Green
This question was previously asked in
UPSC NDA-1 – 2021
The primary colours of light are Blue, Red, and Green.
Primary colours of light are those colours that cannot be produced by mixing other colours of light, and from which a wide range of other colours can be created by mixing. In additive colour mixing (mixing of light), the primary colours are Red, Green, and Blue (RGB). This is the basis for how colours are displayed on screens (TVs, monitors, phones).
The combination of the three primary colours of light in equal proportions results in white light. Combining any two primary colours produces a secondary colour: Red + Green = Yellow, Red + Blue = Magenta, Green + Blue = Cyan. These secondary colours of light are the primary colours of pigment (in subtractive mixing).