What type of tool did Charles employ to analyze user activities on a network?

The choice of ActivTrak as the tool Charles employed to analyze user activities on a network is well-founded due to its specific functional capabilities. ActivTrak is designed to monitor and analyze user behavior and activities in a detailed manner, providing insights about user engagement, productivity, and potential security concerns. This tool is particularly useful for tracking how users interact with systems and applications, which can be critical for identifying unusual behavior that may indicate insider threats or policy violations.

In contrast, while network scanners, intrusion detection systems, and security information and event management systems have their valuable applications in network security, they focus more on different aspects of network integrity, traffic analysis, or incident response rather than specifically analyzing user behavior. Network scanners typically identify devices and their configurations, intrusion detection systems monitor for malicious activities or policy violations, and security information and event management systems help in aggregating and managing security alerts. However, none of these tools are specifically tailored for in-depth user activity analysis like ActivTrak is.