Final answer:
Analyzing activity logs is a key function of security to identify compliance violations and ensure adherence to regulations. It helps security teams detect possible breaches of policy by monitoring deviations from established standards.
Step-by-step explanation:
An important security function is to analyze activity logs primarily for B) Compliance Violations. Companies and organizations are required to adhere to various regulations and standards, such as GDPR, HIPAA, or PCI DSS. By reviewing logs, a security team can identify any action that deviates from established policies, highlighting potential compliance issues. While these logs can also offer insights into system performance, employee productivity, and network speed, the key function in a security context is to ensure that activities are in line with regulatory requirements and to investigate potential breaches of policy.