6. Which of the following statements is NOT an element of a well-designed Service System?a. It is consistent with the operating focus of the firm. b. It is user-friendly so customers can easily interact with the service process. c. It is robust and therefore capable of coping with variations in demand and resource availability. d. It is structured so that consistent performance by its people and systems is easily maintained. e. It effectively separates the back office and the front office so each can focus on their own tasks in order to optimize their departmental performance.