You work as the network administrator at abc.com, which contains three domains. The functional level of all three domains is set at Windows 2000 mixed. A new file server named Serv1 is added in one of the domains. This file server will host shared folders. Users in all three domains will need access to the shared folders on Serv1. You aim at creating a group that will be assigned the permissions required for users to access the shared folders on Serv1. Which of the following should you do?