A legacy software is hosted on an EC2 instance which has the license tied to the MAC address. So from your experience with AWS you know that every time an instance is restarted it will almost certainly lose it`s MAC address. What would be a possible solution to this given the options below? Choose an answer from the options below

Answer options:

A.Make sure any EC2 Instance that you deploy has a static IP address that is mapped to the MAC address.
B.Use a VPC with a private subnet for the license and a public subnet for the EC2.
C.Use a VPC with a private subnet and configure the MAC address to be tied to that subnet.
D.Use a VPC with an elastic network interface that has a fixed MAC Address.

Answer – D
There is a good example in the AWS documentation which supports option
D.For more information on elastic network interfaces please visit the below URL:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html