An organization is hosting 2 application servers within a VPC. Which two mechanisms will make sure that in an event of one application server going down, new connections to the application are sent only to the other application server, without having to make any modifications manually?
A. Create a secondary ENI that can be moved from one application server to another.
B. Assign a secondary private IP address to the primary ENI that can be moved to a secondary instance.
C. Setting an ELB to route traffic to both the application servers.
D. Use Route 53 health checks to route traffic to a failover instance.
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