A. Attach an IAM policy to the users or groups that require access to the EC2 instances.
B. Attach an IAM role to control access to the EC2 instances.
C. Create a placement group for the EC2 instances and add a specific tag.
D. Create a service account and attach it to the EC2 instances that need to be controlled.
E. Create an IAM policy that grants access to any EC2 instances with a tag specified in the Condition element.