A. Create an AWS account for each business unit. Move each business unit’s instances to its own account and set up a federation to allow users to access their business unit’s account.
B. Set up a federation to allow users to use their corporate credentials, and lock the users down to their own VPC. Use a network ACL to block each VPC from accessing other VPCs.
C. Implement a tagging policy based on business units. Create an IAM policy so that each user can terminate instances belonging to their own business units only. Most Voted
D. Set up role-based access for each user and provide limited permissions based on individual roles and the services for which each user is responsible.