单选题1. import java.io.*；  2. public class Foo implements Serializable {  3. public int x， y；  4. public Foo（ int x， int y） { this.x = x； this.y = y； }  5.  6. private void writeObject（ ObjectOutputStream s）  7. throws IOException {  8. s.writeInt（x）； s.wri

1. import java.io.*；  2. public class Foo implements Serializable {  3. public int x， y；  4. public Foo（ int x， int y） { this.x = x； this.y = y； }  5.  6. private void writeObject（ ObjectOutputStream s）  7. throws IOException {  8. s.writeInt（x）； s.writeInt（y）  9. }  10.  11. private void readObject（ ObjectInputStream s）  12. throws IOException， ClassNotFoundException {  13.  14. // insert code here  15.  16. }  17. }  Which code， inserted at line 14， will allow this class to correctly serialize and deserialize？（）