Which security service helps audit device configurations and detect abnormal behavior?

The correct answer is AWS IoT Device Defender because it is specifically designed to help secure IoT devices by auditing their configurations and monitoring for suspicious or abnormal behavior. This service allows administrators to set up security policies that regularly check device configurations to ensure compliance with security best practices. Additionally, it provides the capability to monitor the behavior of devices in real time, helping to identify potential security issues or deviations from established norms.

This proactive monitoring assists in quickly responding to potential threats, ensuring that IoT environments remain secure. By focusing on both audits and behavior analysis, AWS IoT Device Defender encompasses a comprehensive approach to managing the security of IoT devices, making it an essential tool for maintaining a secure network of devices.