The correct answer is D - Security information and event management (SIEM).
According to WGU Cybersecurity Architecture and Engineering (KFO1 / D488), a SIEM collects and correlates event data from multiple sources (such as cloud and on-premises environments) in real-time. It provides centralized visibility, analysis, and alerting, which is critical in hybrid cloud deployments.
File integrity monitoring (A) watches for unauthorized file changes, not event correlation. DLP (B) protects sensitive data but does not correlate events. IDS (C) detects network intrusions but does not combine event data centrally.
Reference Extract from Study Guide:
"Security information and event management (SIEM) systems collect, normalize, correlate, andanalyze security event data from multiple sources, providing centralized monitoring and alerting."
- WGU Cybersecurity Architecture and Engineering (KFO1 / D488), Security Monitoring and Event Management