The secondary colors are classified as those that are created by mixing two primary colors together. In the context of color theory, the primary colors are red, blue, and yellow. When these primary colors are combined, they yield the secondary colors of orange, green, and violet.
For instance, mixing red and yellow produces orange, blue and yellow create green, and red combined with blue results in violet. This mixing of the primary colors to form the secondary colors is fundamental to understanding color relationships in design and art. Therefore, the classification of orange, green, and violet as secondary colors is indeed correct.
The other options provide unrelated colors or combinations that do not align with the definitions of primary and secondary colors.