6. (2 marks) Identify the two classes (A, B, C, D, E, F) in the following program code that is using the Shape class correctly? A. public class circle implements shape f private int radius; B. publie abstract class cirele extends shape private int radius: c. public class circle extends shape 1 private int radius; public void draw (): 1 D. public abstract elass cirele inplenents shape T private int radius; pub1ic void draw(): E. public class circle extends shape private int radius: public void draw() 1 F. publie abstract elass cirele implenents shape private int radiuss public void draw () 1 1/ additional code here */