Which is an advantage of the joint application design (jad) approach? a. it reduces the need to train information system users and increases the system’s chance of success by encouraging users’ involvement. b. it incorporates varying viewpoints from different functional areas of an organization to ensure that collected requirements for an application is not too narrow or one-dimensional in focus. c. it provides a method for investigating an environment in which a problem is poorly defined and information is difficult to gather. d. it improves communication among users, top management, and information systems personnel because seeing a concrete model often prompts potential users of the system to ask questions, express opinions, and so forth.