The question involves an engineer configuring a Cisco MDS 9000 Series Switch and noticing that the name server with IP 192.168.10.11 is missing from the configuration. The correct action to complete the configuration is option C, "Enter yes at step 21 to edit the configuration. Add the line dns-server 192.168.10.11." This step allows the engineer to modify the initial setup process's outcome by adding the missing DNS server information directly into the configuration before saving it. References: For further details, refer to the Cisco Data Center Core Technologies source documents or study guides available on the official Cisco Learning Network Store and Cisco's solution listings for data center virtualization.