Analyze the following code.

Question

```
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
public class Test extends Application {
@Override // Override the start method in the Application class
public void start(Stage primaryStage) {
Button btOK = new Button("OK");
Button btCancel = new Button("Cancel");

EventHandler handler = new EventHandler() {
public void handle(ActionEvent e) {
System.out.println("The OK button is clicked");
}
};

btOK.setOnAction(handler);
btCancel.setOnAction(handler);

HBox pane = new HBox(5);
pane.getChildren().addAll(btOK, btCancel);

Scene scene = new Scene(pane, 200, 250);
primaryStage.setTitle("Test"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show(); // Display the stage
}

/**
* The main method is only needed for the IDE with limited JavaFX
* support. Not needed for running from the command line.
*/
public static void main(String[] args) {
launch(args);
}
}
```
a. When clicking the OK button, the program displays The OK button is clicked.
b. When clicking the Cancel button, the program displays The OK button is clicked.
c. When clicking either button, the program displays The OK button is clicked twice.
d. The program has a runtime error, because the handler is registered with more than one source.

Answer 1

a. When clicking the OK button, the program displays The OK button is clicked.
b. When clicking the Cancel button, the program displays The OK button is clicked.