Which tool is used for logging user activity?

The tool specifically used for logging user activity is the Audio Log. This tool captures audio recordings that can help in monitoring interactions and activities of users in systems where audio input is relevant. The audio log serves to document and analyze user actions and can be essential in environments that require compliance, security assessments, or performance evaluations based on audio interactions.

In contrast, the other options do not specifically focus on user activity in the same way. The User Activity Tracker typically tracks actions performed by users in a system but may not specifically deal with audio. The System Monitor generally oversees the overall health and performance of the system rather than focusing solely on user activity. The Event Logger primarily records system and application events rather than detailed user actions. Thus, the Audio Log stands out as the correct choice for the logging of user activity, particularly in contexts that involve audio monitoring.