Which major NIMS Component discusses organizational structures for incident management at operational levels?

The correct answer focuses on the "Command and Coordination" component of the National Incident Management System (NIMS), which is essential for effective incident management. This component establishes a clear structure for managing incidents, detailing how different organizations and units within those organizations should interact during incidents. It emphasizes the frameworks needed for leadership roles and their responsibilities at various operational levels, which allows for a coordinated response across various agencies and stakeholders.

In addition to defining roles, the Command and Coordination component addresses the hierarchical structure of the Incident Command System (ICS), ensuring that everyone involved in incident management understands their specific responsibilities and reporting relationships. This ensures that efforts are not duplicated, the chain of command is maintained, and resources are allocated efficiently.

While other components like "Support Structures," "Response Framework," and "Resource Management" are relevant to incident management, they do not specifically focus on the organizational structures and leadership dynamics critical for operational command and coordination during incidents. Therefore, the emphasis on organizational structures and clarity in roles makes "Command and Coordination" the most fitting answer to the question.