A user can receive email but cannot send email with the email client software. Which of the following protocols is incorrectly configured?

You have an environment that consists of a public subnet using Amazon VPC and 3 instances that are running in this subnet. These three instances can successfully communicate with other hosts on the Internet. You launch a fourth instance in the same subnet, using the same AMI and security group configuration you used for the others, but find that this instance cannot be accessed from the internet. What should you do to enable Internet access?

A. Deploy a NAT instance into the public subnet. B. Assign an Elastic IP address to the fourth instance. C. Configure a publically routable IP Address in the host OS of the fourth instance. D. Modify the routing table for the public subnet.

What must be done to a Windows Server before it can assign IPv6 addresses via DHCPv6?

What will be an ideal response?