8. in GUI1, we only import one package: import javax.swing.* But in Gu12a, we import three packages import java.awt.event.* import java awt.* import javax.swing.* Why? ecause we want to implement the ActionListener interface, we need to import java awt.event package Because we want to use a layout manager to arrange and maintain the arrangement of widgets on the screen, we need to import java.awt." B package C. Both A and B D. None of them