__________________ automates the discovery of sensitive data at scale and lowers the cost of protecting your data using machine learning and pattern matching techniques.

Answer options:

A.Amazon Macie
B.AWS Shield
C.Amazon GuardDuty
D.AWS Security Hub

Answer: A
Option A is CORRECT. Amazon Macie automates the discovery of sensitive data at scale and lowers the cost of protecting your data.
Option B is INCORRECT. AWS Shield is a managed Distributed Denial of Service (DDoS) protection service that safeguards applications running on AWS.
Option C is INCORRECT. Amazon GuardDuty is a threat detection service that continuously monitors the malicious activities and unauthorized behaviors to protect your AWS accounts, workloads, and data stored in Amazon S3.
Option D is INCORRECT. AWS Security Hub gives you a comprehensive view of your high-priority security alerts and security posture across your AWS accounts.
References:
https://aws.amazon.com/macie/
https://aws.amazon.com/shield/
https://aws.amazon.com/guardduty/
https://aws.amazon.com/security-hub/