A. Ensure that all AWS accounts are part of an organization in AWS Organizations with all features enabled.
B. Use AWS Config to report on the attachment of an IAM policy that denies access to the ec2:PurchaseReservedInstancesOffering action and the ec2:ModifyReservedInstances action.
C. In each AWS account, create an IAM policy that denies the ec2:PurchaseReservedInstancesOffering action and the ec2:ModifyReservedInstances action.
D. Create an SCP that denies the ec2:PurchaseReservedInstancesOffering action and the ec2:ModifyReservedInstances action. Attach the SCP to each OU of the organization.
E. Ensure that all AWS accounts are part of an organization in AWS Organizations that uses the consolidated billing feature.

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