What Applet method can you use to play a sound file?

Answer: The method used in an Applet to play a sound file is the 'play' method, which has the following signature: `public void play(URL url)`. It takes a URL as an argument representing the location of the sound file to be played. An example of its usage is as follows: ```java import java.applet.*; import java.net.*; public class SoundApplet extends Applet { public void init() { try { URL soundFile = new URL(getCodeBase(), "soundFile.wav"); play(soundFile); } catch (MalformedURLException e) { e.printStackTrace(); } } } ``` In this example, the 'play' method is called in the 'init()' method of the applet, automatically playing the sound file 'soundFile.wav' located in the same directory as the applet's code.