A user has configured ELB with two EBS backed EC2 instances. The user is trying to understand the DNS access and
IP support for ELB. Which of the below mentioned statements may not help the user understand the IP mechanism
supported by ELB?

A.
The client can connect over IPV4 or IPV6 using Dualstack

B.
ELB DNS supports both IPV4 and IPV6

C.
Communication between the load balancer and back-end instances is always through IPV4

D.
The ELB supports either IPV4 or IPV6 but not both

Explanation:
Elastic Load Balancing supports both Internet Protocol version 6 (IPv6) and Internet Protocol version 4 (IPv4) Clients can
connect to the user’s load balancer using either IPv4 or IPv6 (in EC2-Classic) DNS. However, communication between
the load balancer and its back-end instances uses only IPv4. The user can use the Dualstack-prefixed DNS name to
enable IPv6 support for communications between the client and the load balancers. Thus, the clients are able to access
the load balancer using either IPv4 or IPv6 as their individual connectivity needs dictate.