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Jennifer, a client services manager in an advertising agency, is on vacation. Her smartphone lets her clients and subordinates know that she is available for hands-free cell-phone conversations at certain times of a day, and at other times communicates that she is available for IM or videoconferencing, depending on her activities at the vacation spot. Which of the following technologies is Jennifer's system using? a. Integrated marketing communications b. Unified communication c. Enterprise resource planning d. Customer relationship management