In an international food festival, Raina can try foods from Korea and Japan. She can choose to try foods from one or neither, but not both, of these countries. In the braces below, list all the possible sets of countries whose food Raina can try. Write each set in your list in roster form. If there is more than one set in your list, separate them with commas. If you need the empty set in your list, use the symbol . Korea Japan D