Final answer:
The highest priority during an incident response is containing the damage to prevent further issues, before focusing on gathering information or finding expert information, and then identifying the root cause.
Step-by-step explanation:
The highest priority of first responders during an incident response is D) containing the damage. This step is crucial to prevent further harm and to mitigate the impact of the incident on the organization's operations. Initially, gathering information from customers and other stakeholders is important to understand the scope of the issue. However, before moving on to finding expert information for a deeper analysis or conducting a root cause analysis, it is imperative to contain the ongoing threat. Once the immediate threat is managed, responders can work on identifying the root cause, collecting evidence for further analysis, and eventually restoring normal operations.