Option B. cs-uri-stem (Requested URI) is the best answer because the question is about understanding what resources were being targeted and whether the pattern suggests scanning, probing, or exploitation. CHFI v11 explicitly includes IIS Web Server Architecture and Logs , Analyzing IIS Logs , and investigating web attacks by examining server logs.

The requested URI tells the investigator exactly which pages, scripts, directories, or endpoints the client attempted to access. That is crucial when determining whether a single IP is walking through administrative paths, probing known vulnerable resources, or repeatedly targeting a specific application component. It provides more insight into the nature of the activity than simply knowing the client IP, which is already known from the scenario.

sc-status is useful for checking whether requests succeeded, and cs-user-agent can help identify tools or automation, but neither is as central as the requested resource path when the goal is to understand the intent and pattern of the requests. Therefore, under CHFI web-log analysis objectives, the most informative field here is cs-uri-stem .