Final answer:
According to Mintzberg's findings, managers often use informal channels for communication.
Step-by-step explanation:
According to Mintzberg's findings, the statement that is true regarding a manager's communication is c) Managers often use informal channels for communication. Mintzberg's research highlighted that a significant amount of managerial communication occurs through informal channels such as face-to-face conversations, phone calls, and emails, rather than through formal channels. Informal communication allows managers to build relationships, gather information, and resolve issues more efficiently.