You are configuring a Windows Server 2016 failover cluster in a workgroup.
Before installing one of the nodes, you run the ipconfig /all command and receive the following output.

You need to ensure that Server1 can be added as a node in the cluster.
What should you do?

A.
Configure a DNS suffix.

B.
Enable NetBIOS over TCP/IP.

C.
Change the Node Type to Broadcast.

D.
Assign a static IP address.

Explanation:
In addition to the pre-requisites of Single-domain clusters, there are additional pre-requisites for Multi-domain or
Workgroup clusters in the Windows Server 2016 including Primary DNS Suffix Requirements.
* Each cluster node needs to have a primary DNS suffix.
* For Multi-domain Clusters: The DNS suffix for all the domains in the cluster, should be present on all cluster
nodes…
Note: Failover Clusters can now be created in the following configurations:
Single-domain Clusters: Clusters with all nodes joined to the same domain
Multi-domain Clusters: Clusters with nodes which are members of different domains
Workgroup Clusters: Clusters with nodes which are member servers / workgroup (not domain joined)
https://blogs.msdn.microsoft.com/clustering/2015/08/17/workgroup-and-multi-domain-clusters-inwindows-server-2016/