Consider the following set of initial user requests from a telephone company about a new customer service system: “The telephone company customer service shall be able to record and answer questions about telephone installations.” When a customer requests a new telephone, the service representative shall record the customer’s name, address, assigned phone installer, and the projected time of the installation. “At the end of each day, the technicians shall record their work. Start time shall include the year, month, day, hour, and minute. Identify the actors in this case study.