What is the output of the following code?
```
public class Test {
public static void main(String[] args) {
String s1 = "Welcome to Java!";
String s2 = s1;
if (s1 == s2)
System.out.println("s1 and s2 reference to the same String object");
else
System.out.println("s1 and s2 reference to different String objects");
}
}
```
a. s1 and s2 reference to the same String object
b. s1 and s2 reference to different String objects
a. s1 and s2 reference to the same String object
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