A solution architect would like to integrate Amazon RDS for SQL Server instance with an existing Active Directory Domain. What service would enable the solution architect to implement a solution?

Answer options:

A.AWS Directory Service
B.AWS Single Sign-On
C.AWS Cognito
D.Amazon WorkLink

Answer: A
AWS Directory Service provides Microsoft Active Directory (AD) directory service that can be used to create an Active Directory environment in the AWS cloud. Other applications can join the provided domain and access the RDS for SQL Server instances in that same domain. Therefore,
Option A is CORRECT, and all other options are incorrect.
Reference:
https://aws.amazon.com/blogs/database/integrate-amazon-rds-for-sql-server-db-instances-with-an-existing-active-directory-domain/
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_SQLServerWinAuth.html