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单项选择题 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；

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