Analyze the following code:
```
public class Test {
public static void main(String[] args) {
String s = new String("Welcome to Java");
Object o = s;
String d = (String)o;
}
}
```
a. When assigning s to o in Object o = s, a new object is created.
b. When casting o to s in String d = (String)o, a new object is created.
c. When casting o to s in String d = (String)o, the contents of o is changed.
d. s, o, and d reference the same String object.
d. s, o, and d reference the same String object.
Casting object reference variable does not affect the contents of the object.
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