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package geometry； 
public class Hypotenuse { 
public InnerTriangle it = new InnerTriangle（）； 
class InnerTriangle { 
public int base； 
public int height； 
} 
} 
Which is true about the class of an object that can reference the variable base？ （）

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？（）