A. Use Login with Amazon allowing users to sign in with an Amazon account providing the mobile app with access to the ScoreData DynamoDB table and the GameState S3 bucket
B. Use temporary security credentials that assume a role providing access to the ScoreData DynamoDB table and the GameState S3 bucket using web identity federation
C. Use an IAM user with access credentials assigned a role providing access to the ScoreData DynamoDB table and the GameState S3 bucket for distribution with the mobile app
D. Use an EC2 instance that is launched with an EC2 role providing access to the ScoreData DynamoDB table and the GameState S3 bucket that communicates with the mobile app via web services