Which AWS service will meet these requirements in the LEAST amount of time?

Explanations:

AWS Glue is primarily used for data integration and ETL (Extract, Transform, Load) processes. It does not focus on discovering sensitive data or identifying potential exposure of that data.

Amazon Polly is a text-to-speech service that converts text into natural-sounding speech. It does not provide capabilities for discovering sensitive data or assessing data exposure.

Amazon Macie is specifically designed for discovering and protecting sensitive data on AWS. It uses machine learning and pattern matching to identify sensitive data such as PII and alerts on potential exposure, making it the best fit for this requirement.

AWS Secrets Manager is used for managing and retrieving secrets, such as API keys and database credentials. It does not discover sensitive data across AWS services or assess exposure.