Given is a equilateral triangle. What colours do you need to specify for the vertices in order to make the centre point light grey (RGB value (2/3, 2/3, 2/3 Select one: O a. The vertices must be cyan, red and yellow. O b. The vertices must be red, green and blue. O c. The vertices must be magenta, green and blue. O d. The vertices must be red, yellow and blue. O e. The vertices must be cyan, magenta, and yellow.