Final answer:
Unified Command ensures control of a large-scale incident involving multiple agencies with overlapping authority and responsibility.
Step-by-step explanation:
The correct answer is Unified Command. Unified Command ensures control of a large-scale incident involving multiple agencies with overlapping authority and responsibility. It is a system used in emergency management, where representatives from different agencies work together to make decisions and coordinate response efforts. This allows for effective and coordinated response to incidents, ensuring that all agencies work together in a cohesive manner.