A company is setting up a development environment on AWS for a team of developers. The team needs to access multiple Amazon S3 buckets to store project data. The team also needs to use Amazon EC2 to run development instances. The company needs to ensure that the developers have access only to specific Amazon S3 buckets and EC2 instances. Access permissions must be assigned according to each developer's role on the team. The company wants to minimize the use of permanent credentials and to ensure access is securely managed according to the principle of least privilege. Which solution will meet these requirements?