What can the company do to meet this requirement?
Use AWS Key Management Service (AWS KMS).
Use multiple AWS accounts and consolidated billing.
Use AWS CloudFormation to deploy the infrastructure.
Rightsize all the EC2 instances that are used in the deployment.
Explanations:
AWS Key Management Service (KMS) is used for managing encryption keys and does not directly affect the cost-effectiveness of running EC2 instances.
Using multiple AWS accounts and consolidated billing can help manage costs across accounts but does not directly optimize the costs for EC2 instance usage.
AWS CloudFormation is a tool for deploying and managing infrastructure as code; while it aids in efficient resource management, it does not specifically address cost-effectiveness for running workloads on EC2.
Rightsizing EC2 instances ensures that the company is using the appropriate instance types and sizes for its workload, thereby minimizing costs by avoiding over-provisioning and paying for unnecessary capacity.
I appraise that the answer is:
Rightsize all the EC2 instances that are used in the deployment.