Connections are made to the instance using its private IPv4 address. A solutions architect needs to design a solution that will allow traffic to be quickly directed to a standby instance if the application fails and becomes unreachable.
Which approach will meet these requirements?
- Deploy an Application Load Balancer configured with a listener for the private IP address and register the primary instance with the load balancer. Upon failure, de-register the instance and register the secondary instance.
- Configure a custom DHCP option set. Configure DHCP to assign the same private IP address to the secondary instance when the primary instance fails.
- Attach a secondary elastic network interface (ENI) to the instance configured with the private IP address. Move the ENI to the standby instance if the primary instance becomes unreachable.
- Associate an Elastic IP address with the network interface of the primary instance. Disassociate the Elastic IP from the primary instance upon failure and associate it with a secondary instance.