Which of the following statements is true of Young and Helmholtz's trichromatic theory? It states that there are four types of cones present in the human visual system B It states that there are three types of rods present in the human visual system, it is based on experiments showing that cells in the visual system respond to red-green and blue-yellow colors. It is based on experiments showing that a person with normal vision can match any color in the spectrum by combining three other wavelengths
