At what stage in the following method does the object initially referenced by s becomes available for garbage collection. Select the one correct answer.
void method X() {
String r = new String("abc");
String s = new String("abc");
r = r+1; //1
r = null; //2
s = s + r; //3
} //4
Before statement labeled 1
Before statement labeled 2
Before statement labeled 3
Before statement labeled 4
Never.
Can someone explain what will be the answer to this question and why ?