Which activity describes system monitoring in the security operate phase?

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Which activity describes system monitoring in the security operate phase?

A. Define processes and principles to address, manage, and monitor the security system security-related issues
B. Create final network documentation that reflects "as-built" information for customers, including specific design requirements and configurations.
C. Conduct monitoring activities, and report on service-level metrics and abnormal events or trends that may adversely affect the availability, capacity, performance, and security of the security system.
D. Document planning of assumptions and decisions; facilitate communication among stakeholders; and document approved scope, cost, and schedule baselines