1. public class Target {  2. private int i = 0；  3. public int addOne（） {  4. return ++i；  5. }  6. }  And：  1. public class Client {  2. public static void main（String[] args） {  3. System.out.println（new Target（）.addOne（））；  4. }  5. }  Which change can you make to Target without affecting Client？（） 

• A、 Line 4 of class Target can be changed to return i++；
• B、 Line 2 of class Target can be changed to private int i = 1；
• C、 Line 3 of class Target can be changed to private int addOne（） {
• D、 Line 2 of class Target can be changed to private Integer i = 0；