Which of the following tools is best for logging and monitoring in a cloud environment?

A Security Information and Event Management (SIEM) system is best for logging and monitoring in a cloud environment because it collects, aggregates, and analyzes security data from various sources, including cloud platforms, applications, and network devices. This allows for real-time monitoring, threat detection, and incident response across the entire cloud infrastructure. An Intrusion Prevention System (IPS) primarily focuses on preventing attacks, not comprehensive logging and analysis. File Integrity Monitoring (FIM) tracks changes to critical files but doesn't provide broad security event correlation. Network Access Control (NAC) manages device access to a network but isn't designed for extensive logging and security analytics across a cloud environment.