Which indicators may signify that an incident is expanding?

The correct answer highlights the critical signs that an incident is growing in complexity and scale. Rapidly escalating threats indicate that the situation is worsening, creating a need for a more robust response. This could encompass various factors, such as increased hazards, greater demand on resources, or an expansion of the affected area. The mention of increased resource requests further supports the notion of an expanding incident, as it suggests that the current resources are insufficient to handle the demands of the situation, thereby necessitating additional support.

In contrast, decreased resource requests would likely indicate a stabilizing or resolving incident, instead of an expansion. Increased communication among staff only does not necessarily signify an expanding incident, as communication can increase for numerous reasons that do not relate directly to the severity or size of an incident. Lastly, the complete resolution of the incident is a clear indicator that the incident is closing, not expanding. Therefore, the combination of escalating threats and increased resource needs robustly signifies the growth of an incident.