Which is a function of the "Inventory" step in the SIR Customer Adoption Journey?

The function of the "Inventory" step in the Security Incident Response (SIR) Customer Adoption Journey specifically involves establishing baseline metrics. This step is critical because it helps organizations understand their current security posture and how it aligns with their incident response capabilities. By establishing baseline metrics, organizations can identify what's normal for their environment, which aids in recognizing anomalies that may indicate security incidents.

These metrics may include data on past incidents, the frequency of certain types of incidents, and the average time taken to respond to these incidents. This foundational understanding allows for better planning, prioritization, and improvement in the incident response strategy. The other options, while important in other contexts, do not align directly with the primary purpose of the Inventory phase. For instance, documenting standard operating procedures and reviewing incident responses typically come into play at different stages of the incident response process, while tracking incident counts is a more granular activity that could fall under monitoring rather than the initial inventory assessment aimed at establishing a baseline.