A company is rearchitecting its applications to run on AWS. The company's infrastructure includes multiple Amazon EC2 instances. The company's development team needs different levels of access. The…

AWS Directory Service for Microsoft Active Directory is a fully managed service that allows Windows EC2 instances to be joined to a domain, and AWS IAM Identity Center (formerly AWS Single Sign-On) integrates with it to provide MFA and manage access, fulfilling the requirement for managed services and enhanced security. EC2 instances can be configured to automatically join the domain upon launch, reducing operational overhead.

Manually configuring domain join is less efficient than automatic configuration, and relying on a third-party identity provider for MFA is less aligned with using managed AWS services where possible compared to AWS SSO.

AWS Directory Service Simple AD is not a full-featured Microsoft Active Directory and might not meet advanced domain requirements, while manually joining instances and using an on-premises RADIUS server deviates from a fully managed AWS solution.

Using AWS Directory Service Simple AD might be insufficient for the specified Active Directory requirements, and Amazon WorkSpaces are virtual desktops, not the primary mechanism for joining EC2 instances to a domain.