A. Only Elastic IP can be used by requesting limit increase, since AWS does not assign a public IP to an instance with multiple ENIs.
B. AWS VPC does not attach a public IP to an ENI; so the only way is to use an Elastic IP.
C. I agree with the suggestion but will prefer that the organization should use separate subnets with each ENI for different public IPs.
D. I agree with the suggestion and it is recommended to use a public IP from AWS since the organization is going to use DNS with Route 53. Most Voted

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