Which AWS security service automatically discovers and classifies sensitive data and intellectual property stored in AWS?

Amazon Macie is the correct answer because it is a data security and privacy service that uses machine learning and pattern matching to discover, classify, and protect sensitive data stored in Amazon S3. It identifies personally identifiable information (PII) and intellectual property, and provides visibility into data access patterns. Amazon GuardDuty is a threat detection service that monitors for malicious activity and unauthorized behavior. Amazon Inspector is an automated security assessment service that helps improve the security and compliance of applications deployed on AWS. AWS Shield is a managed Distributed Denial of Service (DDoS) protection service.