The correct answer is C, Amazon GuardDuty. GuardDuty is an intelligent threat detection service that continuously monitors your AWS accounts, Amazon EC2 instances, AWS Lambda functions, Amazon EKS clusters, Amazon Aurora login activity, and data stored in Amazon S3 for malicious activity. It uses machine learning algorithms and threat intelligence to identify patterns and anomalies that may indicate malicious activity. When GuardDuty detects a potential threat, it generates findings and alerts, which can be viewed in the AWS Management Console or integrated with other AWS services for automated responses. This helps organizations quickly identify and respond to security incidents, improving their overall security posture.