In a darkened room in front of a white wall you cast shadows of your hand by two colored lamps, red and green, as shown. The colors of the wall, and the left and right shadows, will respectively appear

 

            a) Yellow, red, and green
            b) Yellow, green, and red
            c) Red, green, and yellow
            d) Green, red, and yellow
            e) Red, yellow, and green
            f) None of these