Final answer:
When providing mutual aid, radio communications may be on either a TAC channel assigned by dispatch or a fire dispatch channel.
Step-by-step explanation:
When providing mutual aid, radio communications may be on either a TAC channel assigned by dispatch or a fire dispatch channel. This means that the correct answer is option D: Both A and C. A TAC (Tactical) channel is generally designated for communication between different agencies or units during emergencies or significant incidents, and fire dispatch channels are specifically allocated for fire department communication. Both of these channels can be used for mutual aid in emergency response situations. It is important to have effective and reliable communication systems to coordinate efforts and ensure efficient response.