Given: Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ?（）
A
move the line 12 print statement into the foo() method
B
change line 7 to public synchronized void go() {
C
change the variable declaration on line 2 to private volatile int x;
D
wrap the code inside the foo() method with a synchronized( this ) block
E
wrap the for loop code inside the go() method with a synchronized block synchronized(this){ //for loop code here }

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