A. Create an IAM role in the production account and allow EC2 instance in the development account to assume that role using the trust policy. Provide read access for the required S3 bucket to this role. Most Voted
B. Use a custom identity broker to allow Developer IAM users to temporarily access the S3 bucket.
C. Create a temporary IAM user for the application to use in the production account.
D. Create a temporary IAM user in the production account and provide read access to Amazon S3. Generate the temporary IAM user’s access key and secret key and store these keys on the EC2 instance used by the application in the development account.