The primary colors of light are the colors that cannot be created by mixing other colors together. Option 2, which includes blue, red, and green, is the correct answer.

Option 1 includes yellow, red, and green. Yellow is not a primary color of light; it is a secondary color because it can be created by mixing red and green light together.

Option 3 includes violet, red, and yellow. Again, yellow is not a primary color of light, so this option is incorrect. Violet is a secondary color and can be created by mixing blue and red light together.

Option 4 includes indigo, violet, and green. Indigo is not a primary color of light; it is part of the visible spectrum but is not considered one of the primary colors. Violet and green are both primary colors, but indigo is not, making this option incorrect.

Therefore, the correct answer is option 2, which includes the primary colors of light: blue, red, and green.