单选题 A read only news reporting site with a combined web and application tier and a database tier that receives large and unpredictable traffic demands must be able to respond to these traffic fluctuations automatically. What AWS services should be used meet these requirements?

A、 Stateless instances for the web and application tier synchronized using ElastiCache Memcached in an autoscaling group monitored with CloudWatch. And RDS with read replicas.
B、 Stateful instances for the web and application tier in an autoscaling group monitored with CloudWatch and RDS with read replicas
C、 Stateful instances for the web and application tier in an autoscaling group monitored with CloudWatch. And multi-AZ RDS
D、 Stateless instances for the web and application tier synchronized using ElastiCache Memcached in an autoscaling group monitored with CloudWatch and multi-AZ RDS
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D、Register the JavaScript application with a Web Identity Provider like Amazon, Google, or Facebook, create an IAM role for that provider, and set up permissions for the IAM role to allow DynamoDB puts. You serve your mobile application out of Apache EC2 instances that are load-balanced and autoscaled. Your EC2 instances are configured with an IAM role that allows DynamoDB puts. Your server updates DynamoDB 向 Web Identity Provider (如 Amazon、 Google 或 Facebook)注册 JavaScript 应用程序,为该提供程序创建一个 IAM 角色,并为 IAM 角色设置权限,以允许 DynamoDB 放置。在负载平衡和自动伸缩的 ApacheEC2实例之外为移动应用程序提供服务。您的 EC2实例配置了允许 DynamoDB 放置的 IAM 角色。您的服务器更新 DynamoDB