A Company Has Multiple AWS Accounts Within AWS Organizations and Wants

Multiple Choice

A company has multiple AWS accounts within AWS Organizations and wants to apply the Amazon EC2 Reserved Instances benefit to a single account only. Which action should be taken?

A) Purchase the Reserved Instances from master payer account and turn off Reserved Instance sharing.
B) Enable billing alerts in the AWS Billing and Cost Management console.
C) Purchase the Reserved Instances in individual linked accounts and turn off Reserved Instance sharing from the payer level.
D) Enable Reserved Instance sharing in the AWS Billing and Cost Management console.