New company has ten separate forests spread out across the country and have no existing trusts in place. Your team is investigating implementing a remote desktop infrastructure for all employee workstations. We have a plan, in some cities the workstations will be replaced with thin clients, and in others, employees will be required to bring their own device. All server infrastructure will be housed at the company headquarters datacenter. All users in all cities need to be able to log in to the virtual machines served from the datacenter with their company e-mail address. What problems do you see with the current setup? What should be included in your plan to meet the company's authentication requirements and future growth needs?