What action is required to add additional DNS servers as forwarders?

To add additional DNS servers as forwarders, you need to select the Forwarders tab and input the IP addresses of the DNS servers you wish to use. This action is specific to the DNS management interface within Windows Server, where forwarders are configured to redirect DNS queries to other servers for resolution, particularly when the local DNS server cannot resolve a query on its own.

Selecting the Forwarders tab provides you with the structured interface necessary to manage the forwarding behavior of your DNS server. By inputting the IP addresses of additional forwarders in this section, you ensure that DNS queries can be handled by these specified servers, enhancing both resolution capabilities and overall efficiency of DNS operations.

The other options suggest important tasks related to DNS management but do not directly achieve the goal of adding forwarders. Changing DNS settings in the network adapter influences how the local machine resolves domain names but does not set up additional forwarding servers for DNS resolution. Disabling DNS root hints affects how the DNS server interacts with the broader DNS infrastructure and is not directly related to specifying additional forwarders. Lastly, right-clicking Forwarders and selecting Properties is a step that could lead to managing existing settings, but it does not execute the specific action of adding new forwarders.