Which definition describes the main purpose of a Security Information and Event Management solution?

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Which definition describes the main purpose of a Security Information and Event Management solution?

A. a database that collects and categorizes indicators of compromise to evaluate and search for potential security threats
B. a monitoring interface that manages firewall access control lists for duplicate firewall filtering
C. a relay server or device that collects then forwards event logs to another log collection device
D. a security product that collects, normalizes, and correlates event log data to provide holistic views of the security posture of an environment