What is added to an incident when it is upgraded to "working" status?

When an incident is upgraded to "working" status, it typically undergoes an escalation in resources to address the situation more effectively. The correct answer indicates that the upgrade includes the deployment of an additional Battalion Chief (BC), Engine, and Truck. This is crucial as it signifies an enhanced operational capacity aimed at managing the incident with increased manpower and equipment.

The inclusion of a Battalion Chief ensures that there is a leadership presence responsible for overseeing the improved response strategy, optimizing coordination among the various units involved, and ensuring that safety protocols are adhered to during the operation. Deploying additional Engines and Trucks increases the firefighting or rescue capabilities, providing more tools and support to frontline personnel, thus facilitating a more comprehensive and aggressive response to the incident.

In contrast, other options may imply additional support or resources, but they do not encapsulate the full scope of what is typically understood as a "working" status in incident management. Therefore, the specific mention of a BC along with Engine and Truck emphasizes a structured and resource-efficient approach critical in incident escalations.