Ystem, the design of which was developed using customary structured methods. To manage the intricacy of the application development process, Roger wants to deploy structured development techniques, and he asks Pete, his coworker, for information about these techniques. Pete tells him about structure charts, which show program modules and the relationships among them using various graphical symbols. Roger enquires Pete on how to represent the fact that one program module (a control module) determines subordinate modules that will be invoked. Pete tells him that he can use a condition. What symbol is used for a condition?