1. public class X implements Runnable（  2. private int x；  3. private int y；  4.    5. public static void main（String[]args）  6. X that = new X（）；  7. （new Thread（that））.start（）；  8. （new Thread（that））.start（）；  9. ）  10.    11. public void run（）  （  12. for （；；）  （  13. x++； 14. y++；  15. System.out.printIn（“x=” + x + “， y = ” + y）；  16.     ） 17. ） What is the result？（）

• A、 Errors at lines 7 and 8 cause compilation to fail.
• B、 The program prints pairs of values for x and y that might not always be the same on the same line （for example， “x=2， y=1”）.
• C、 The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by “x=1， y=1”）.
• D、 The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears only for once （for example， “x=1， y=1” followed by “x=2， y=2”）.