public class X implements Runnable （   private int x；   private int y；    public static void main（String args） （   X that = new X（）；   （new Thread（that）） . start（ ）；   （new Thread（that）） . start（ ）；   ）    public synchronized void run（ ） （    for （；；） （    x++；    y++；    System.out.printIn（“x = “ + x + “， y = “ + y）；    ）   ）    ）   What is the result？（）

• A、 An error at line 11 causes compilation to fail.
• B、 Errors at lines 7 and 8 cause compilation to fail.
• C、 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”）
• D、 The program prints pairs of values for x and y that are always the same on the same line （forexample， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by  “x=1， y=1”）
• E、 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=2s， y=2”）