Analyze the following code:

Question

```
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.scene.layout.HBox;
import javafx.scene.shape.Circle;

public class Test extends Application {
@Override // Override the start method in the Application class
public void start(Stage primaryStage) {
HBox pane = new HBox(5);
Circle circle = new Circle(50, 200, 200);
pane.getChildren().addAll(circle);

circle.setCenterX(100);
circle.setCenterY(100);
circle.setRadius(50);
pane.getChildren().addAll(circle);

// Create a scene and place it in the stage
Scene scene = new Scene(pane);
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. The program has a compile error since the circle is added to a pane twice.
b. The program has a runtime error since the circle is added to a pane twice.
c. The program runs fine and displays one circle.
d. The program runs fine and displays two circles.

Answer 1

a. The program has a compile error since the circle is added to a pane twice.