A company uses a set of Amazon EC2 instances to host a website. The website uses an Amazon S3 bucket to store images and media files. The company wants to automate website infrastructure creation to deploy the website to multiple AWS Regions. The company also wants to provide the EC2 instances access to the S3 bucket so the instances can store and access data by using AWS Identity and Access Management (IAM). Which solution will meet these requirements MOST securely?