The human ear hears sounds in the range from 1 kilohertz to 5 megahertz.

Which two ports would be used to connect external devices? (Select two.)

A) SATA B) eSATA C) Jumper D) PATA E) IEEE 1394 F) IEEE 802.1Q

Why doesn't the following code compile correctly?

``` import java.awt.*; import java.awt.event.*; import javax.swing.*; public class ColorCheckBoxWindow extends JFrame { private JCheckBox greenCheckBox; private final int WINDOW_WIDTH = 300, WINDOW_HEIGHT = 100; public ColorCheckBoxWindow() { setTitle("Green Check Box"); setSize(WINDOW_WIDTH, WINDOW_HEIGHT); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); greenCheckBox = new JCheckBox("Green"); greenCheckBox.addItemListener(new CheckBoxListener()); setLayout(new FlowLayout()); add(greenCheckBox); setVisible(true); } public void itemStateChanged(ItemEvent e) { if (e.getSource() == greenCheckBox) { System.exit(0); } } } ``` A) ColorCheckBoxWindow is not implementing the correct listener. B) The button cannot be added to the content pane. C) The itemStateChanged method cannot be coded here. D) greenCheckBox should not be a private member.