A Solutions Architect is designing an application in AWS. The Architect must not expose the application or database tier over the Internet for security reasons.
The application must be low-cost and have a scalable front end. The databases and application tier must have only one-way Internet access to download software and patch updates.
Which solution helps to meet these requirements?
A. Use a NAT Gateway as the front end for the application tier and to enable the private resources to have Internet access.
B. Use an Amazon EC2-based proxy server as the front end for the application tier, and a NAT Gateway to allow Internet access for private resources.
C. Use an ELB Classic Load Balancer as the front end for the application tier, and an Amazon EC2 proxy server to allow Internet access for private resources.
D. Use an ELB Classic Load Balancer as the front end for the application tier, and a NAT Gateway to allow Internet access for private resources.
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