What is the output of the following code?
```
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
public class Test {
public static void main(String[] args) {
IntegerProperty d1 = new SimpleIntegerProperty(1);
IntegerProperty d2 = new SimpleIntegerProperty(2);
d1.bind(d2);
System.out.print("d1 is " + d1.getValue()
+ " and d2 is " + d2.getValue());
d2.setValue(3);
System.out.println(", d1 is " + d1.getValue()
+ " and d2 is " + d2.getValue());
}
}
```
a. d1 is 2 and d2 is 2, d1 is 3 and d2 is 3
b. d1 is 2 and d2 is 2, d1 is 2 and d2 is 3
c. d1 is 1 and d2 is 2, d1 is 1 and d2 is 3
d. d1 is 1 and d2 is 2, d1 is 3 and d2 is 3
a
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