Given the following code segment. public class ColorWheel { public static int color; private int brightness; public ColorWheel() { setBrightness(6): } public ColorWheel (int c) { brightness = c; } public ColorWheel (double d) { brightness = (int)d; } public ColorWheel (int c, int z) { int bri = 7: brightness = C+z: setBrightness(bri); } public void setBrightness(int bright) { brightness - bright) public String toStringo { brightness = bright; } public String toStringo { return "The bright is " + brightness; } } public class ColorApp{ public static void main(String[] args) { ColorWheel c1 = new ColorWheelo; ColorWheel 2 = new ColorWheel(2): ColorWheel c3 = new ColorWheel(4.5); ColorWheel c4 = new ColorWheel (2,3); System.out.print(c4); C4.setBrightness(3); } } How many instance Variables does the code have? 2 B 3 no instance variable