Nikki's server is not available for selection in the Add Roles and Features Wizard. How can she rectify this?

The correct course of action is to add the server to Server Manager and start over. This is an effective solution because the Add Roles and Features Wizard requires that the server being managed is properly registered in Server Manager to be available for selection. If Nikki's server is not visible, it could indicate that it hasn't been added or isn't recognized by the Server Manager interface.

By adding the server to Server Manager, Nikki can refresh the list of available servers and proceed with the desired roles or features configuration. This step ensures that the server is effectively managing and monitored within the server management system, allowing her to retry the process without the need for unnecessary restarts or external support.