AWS Certified Security – Specialty — Question 29

A Security Administrator is restricting the capabilities of company root user accounts. The company uses AWS Organizations and has enabled it for all feature sets, including consolidated billing. The top-level account is used for billing and administrative purposes, not for operational AWS resource purposes.
How can the Administrator restrict usage of member root user accounts across the organization?

Answer options

• A. Disable the use of the root user account at the organizational root. Enable multi-factor authentication of the root user account for each organizational member account.
• B. Configure IAM user policies to restrict root account capabilities for each Organizations member account.
• C. Create an organizational unit (OU) in Organizations with a service control policy that controls usage of the root user. Add all operational accounts to the new OU.
• D. Configure AWS CloudTrail to integrate with Amazon CloudWatch Logs and then create a metric filter for RootAccountUsage.

Correct answer: C

Explanation

The correct answer is C because creating an organizational unit (OU) with a service control policy allows for centralized management and restriction of root user account usage for all operational accounts. Option A only enables multi-factor authentication without restricting usage, B does not apply to root accounts directly, and D focuses on monitoring rather than restricting access.