I have a Parent DNS root domain and two DNS child domains. Due to downsizing, one of my child domains needs removing completely and permanently. It has two domain controllers, is a member of a site for DFS purposes and holds DNS/DHCP roles. Can I simply remove it from its site, demote the two domain controllers and remove its infrastructure roles? Will these completely remove the domain from my domain list and take it officially offline? What is the best way? I have an exchange server at that location.