10. public class Foo implements java.io.Serializable { 
11. private int x； 
12. public int getX（） { return x； } 
12.publicFoo（int x）{this.x=x； } 
13. private void writeObject（ ObjectOutputStream s） 
14. throws IOException { 
15. // insert code here 
16. } 
17. } 
Which code fragment， inserted at line 15， will allow Foo objects to be correctly serialized and deserialized？（） 

Assuming that the serializeBanana2（） and the deserializeBanana2（） methods will correctly use Java serialization and given： 
import java.io.*； 
class Food {Food（） { System.out.print（”1”）； } } 
class Fruit extends Food implements Serializable { 
Fruit（） { System.out.print（”2”）； } } 
public class Banana2 extends Fruit { int size = 42； 
public static void main（String [] args） { 
Banana2 b = new Banana2（）； 
b.serializeBanana2（b）； // assume correct serialization 
b = b.deserializeBanana2（b）； // assume correct 
System.out.println（” restored “+ b.size + “ “）； } 
// more Banana2 methods 
} 
What is the result？（）