The OSI model was designed to provide a framework for networking and internetworking standards. Which of the following are advantages of the OSI model? There are 4 correct answers. a) Provides a structure for defining process underlying networking system. b) Provides reference for vendors to develop interoperable network devices c) Provides faster network services between telecommunication devices d) Provides easier management of complex internetworking system e) Provides standard description of how messages should be transmitted f) Provides cheaper price for network hardware