The correct answer is B, Amazon Macie. Amazon Macie is a data security and data privacy service that uses machine learning to automatically discover, classify, and protect sensitive data stored in Amazon S3 buckets. It helps in identifying and understanding the content of S3 data by analyzing it for sensitive information such as personally identifiable information (PII), financial data, and intellectual property. Macie uses machine learning models to detect data patterns, enabling the identification of sensitive data even if it is stored in an unstructured format or embedded within larger files. It provides automated alerts and generates reports to assist with data privacy and compliance efforts.