The correct answers are: Access Trusted Advisor recommendations in the account where the RDS Oracle databases are actively running and Review the Trusted Advisor check for Amazon RDS Reserved Instance Optimization to identify cost savings from long-term usage.

To properly evaluate Trusted Advisor checks related to Amazon RDS usage and cost optimization, you must view the checks from the specific AWS account where the RDS instances are running. Trusted Advisor does not consolidate service-specific checks like RDS across accounts in the payer accounts dashboard. This means that for actionable insights into RDS resource utilization and recommendations, the finance team must log into the individual account that owns the RDS resources.

The RDS Reserved Instance (RI) Optimization check in Trusted Advisor analyzes On-Demand RDS usage and recommends converting eligible workloads into Reserved Instances based on consistent usage over a 30-day period. Since the company has been using the RDS instances for 90 days, this check is particularly relevant and can highlight significant cost-saving opportunities.

The option Check the Trusted Advisor dashboard in the payer (consolidated billing) account to view RDS-related checks across all linked accounts is incorrect because service-specific checks (such as RDS RI optimization) are only viewable in the accounts where the resources are provisioned. The consolidated billing account only aggregates billing data but does not provide detailed Trusted Advisor insights for other accounts infrastructure.

The option Evaluate the Trusted Advisor check for Amazon RDS Idle DB Instances to identify potential cost reductions for unused RDS databases may seem helpful, but it does not directly apply in this case since the RDS instances in question are high performance and actively used. The Idle DB check is more relevant for identifying underutilized or forgotten instances, not optimizing cost for known active resources.

The option Inspect the Trusted Advisor report for Amazon Redshift Reserved Node Optimization to determine database savings opportunities is irrelevant in this context because the company is using Amazon RDS, not Amazon Redshift. This check focuses on Redshift cluster usage and has no relation to RDS services.

This question is important because it tests your understanding of how Trusted Advisor works in multi-account AWS environments and which checks are most applicable for optimizing costs based on usage patterns. A helpful tip is to remember that Trusted Advisors detailed usage checks (like RI recommendations) are account-specific and cannot be accessed through the billing (payer) account, even though billing data is centralized.

The tricky part of this question is distinguishing between centralized billing and centralized insights. While billing is consolidated, optimization checks like RDS RI recommendations must be accessed directly in the account where the services are running. Also, focusing on the correct type of check (Reserved Instance Optimization vs. Idle DB) requires a clear understanding of usage context.

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