Which of these statements is correct? a. the repaint() method in an applet actually draws something on the applet. b. the repaint() method does not itself call either the paint() or update() method. c. the repaint() method only tells the system that it should call the system will call the paint() method later, when it gets a chance. d. in general, repaint() is called by a program when the picture drawn on the applet has to change.