Why is it necessary to identify the medium before classifying secondary colours?

Correct answer: Because secondary colours differ in pigment and light systems

The governing concept is that colour classification depends on the colour system being used. In subtractive pigment mixing, red, yellow and blue are commonly treated as primaries, producing orange, green and violet as secondary colours. In additive light mixing, red, green and blue combine to produce cyan, magenta and yellow. Therefore, option A is correct; the other options ignore or deny the medium’s effect.