The service best suited for this task is the one that specializes in logging and retaining information of environment activities such as console logins, API calls, and other related actions – enabling security analysis and compliance auditing. While all provided options have a role in the cloud environment, only one is designed specifically for the detailed activity tracking required in this scenario. Config services focus more on configurations and changes to the resources, and monitoring services are more suited for observing performance metrics and setting alarms, while web application firewalls are geared towards protecting applications from common web exploits.