What will be the output of the program? class s1 implements Runnable { int x = 0, y = 0; int addX() {x++; return x;} int addY() {y++; return y;} public void run() { for(int i = 0; i < 10; i++) System.out.println(addX() + " " + addY()); } public static void main(String args[]) { s1 run1 = new s1(); s1 run2 = new s1(); Thread t1 = new Thread(run1); Thread t2 = new Thread(run2); t1.start(); t2.start(); } }

• A. Compile time Error: There is no start() method
• B. Will print in this order: 1 1 2 2 3 3 4 4 5 5...
• C. Will print but not exactly in an order (e.g: 1 1 2 2 1 1 3 3...)
• D. Will print in this order: 1 2 3 4 5 6... 1 2 3 4 5 6...