4. The following Figure illustrates a network model. Study the model carefully and answer the following questions: A Internet Figure C A. What type of network communication model is represented in the Figure C? B. Briefly explain the function of devices labelled A and B within this network model and Give any two services examples that can run on A and B device. (3.0 Marks) C. Who or what provide the rules to govern the communication occurs between device A and B? (1.0 Mark) (1.0 Mark) D. List down the three (3) elements of communications fundamentals illustrated in the above network communication model. (1.5 Marks)