A company uses multiple AWS accounts under consolidated billing. It runs several active high‑performance Amazon RDS for Oracle On‑Demand DB instances for 90 days. The finance team has access to AWS Trusted Advisor in the consolidated billing account and in all member accounts. The finance team needs to review the appropriate Trusted Advisor checks to reduce RDS costs. Which combination of steps should the finance team take? (Choose two.)

The consolidated billing account provides a centralized view of Trusted Advisor checks across all member accounts, making it efficient to see all RDS instance checks at once. Reviewing the "Amazon RDS Idle DB Instances" check helps identify RDS instances that are not being utilized, allowing the finance team to terminate them and reduce costs. The "Amazon RDS Reserved Instance Optimization" check is also relevant for cost reduction by recommending the purchase of Reserved Instances, but the question specifically mentions "On-Demand" instances, making idle instance identification a more immediate and direct cost-saving measure for the current setup. The "Amazon Redshift Reserved Node Optimization" check is irrelevant as the question pertains to RDS.