At which level of ICS are crews actively performing necessary activities?

The Task Level is where crews actively perform the necessary activities. This level is focused on the execution of the operational assignments required to manage an incident effectively. At the Task Level, personnel carry out specific duties and functions that contribute directly to incident objectives, such as firefighting, medical assistance, or search and rescue operations.

In contrast, the other levels have different primary functions. The Tactical Level involves planning the strategies to achieve the objectives set forth by the Command Level. The Incident Level is more general and encompasses the overall handling of the incident, including coordination and supervision. Lastly, the Command Level is responsible for leadership and decision-making, setting priorities, and overseeing the incident as a whole. Thus, the priority at Task Level is hands-on activities, making it the appropriate choice for this question.