A Solutions Architect has a multi-layer application running

in Amazon VPC. The application has an ELB Classic Load Balancer as the front end in a public subnet, and an Amazon EC2-based reverse proxy that performs content-based routing to two backend Amazon EC2 instances hosted in a private subnet. The Architect se

es tremendous traffic growth and is concerned that the reverse proxy and current backend set up will be insufficient.

Which actions should the Architect take to achieve a cost-effective solution that ensures the application automatically scales to meet tra

ffic demand? (Select two.)

A. Replace the Amazon EC2 reverse proxy with an ELB internal Classic Load Balancer.

B. Add Auto Scaling to the Amazon EC2 backend fleet.

C. Add Auto Scaling to the Amazon EC2 reverse proxy layer.

D. Use t2 burstable instance typ

es for the backend fleet.

E. Replace both the frontend and reverse proxy layers with an ELB Application Load Balancer.