Final answer:
The statement about dispatcher supervisors overseeing dispatch activities, assisting in communication plan formulation, and possibly having equally qualified deputies is true. Coordination of all radio and telephone traffic happens through a communication plan.
Step-by-step explanation:
The statement regarding the responsibilities of a dispatcher supervisor is true. These supervisors are indeed responsible for the direct management and supervision of all dispatch activities, including the assistance in the formation of the communication plan. Additionally, it is often necessary for deputies to be equally qualified, as they may need to fulfill the role of the supervisor in their absence. All radio and telephone traffic in the dispatch center is coordinated through a communications plan, to ensure efficient and effective communication.