The final step in the NIST incident response plan is updating incident response procedures based on lessons learned from the incident.

Conflicting threat feed verdicts (malicious vs. benign) result in an "Unknown" verdict in Cortex XSOAR until further analysis resolves the conflict.

SOAR adds automation to respond to alerts, reducing manual intervention compared to SIEM, which primarily collects and correlates data.

Indicator Verdict directly reflects the assessed maliciousness of an indicator, allowing the analyst to quickly prioritize those that pose the highest immediate risk regardless of their source.

This scenario clearly describes a False Positive epidemic. The custom rule is too broad, leading to many alerts for benign activities. The most effective strategic adjustment (Option C) is to refine the rule. This involves adding more specific exclusion criteria (e.g., allowing PowerShell scripts signed by trusted vendors, or from specific IT automation directories), incorporating contextual information to differentiate benign from malicious (e.g., PowerShell running in a privileged context versus a user context, or attempts to disable security features only when associated with known malicious indicators), and potentially building a baseline of normal PowerShell behavior to identify true anomalies.
Option A and B misclassify the situation.
Option D suggests automating responses, which is dangerous with a high False Positive rate.
Option E is an overreaction; disabling the rule entirely creates a False Negative risk, instead of refining it.