The CMYK color model is used in printing and stands for Cyan, Magenta, Yellow, and Key (black). It is a subtractive color model, which means that the more colors are added, the darker the resulting color becomes. The color brown, which is represented by the color brown, cannot be created by mixing cyan, magenta, yellow, and black inks. Therefore, the correct answer is "น้ำตาล" (brown).