You are the network administrator for Testking.com. The network consists of a single Active Directory forest that contains three domains. The functional level of the forest is Windows Server 2003. The domain names are testking.com, europe.testking.com, and asia.testking.com. Each domain contains 500 user accounts. TestKing.com is in the process of acquiring several other companies whose networks will be add to the testking.com Windows Server 2003 domain. These acquisitions will entail the addition of several new offices, which will be connected to TestKing's network by means of dedicated 56-Kbps WAN connections. You create a new shared folder named NewProjects on a file server in testking.com. Several users in each existing domain need access to the NewProjects folder. These users are not in the same group in any domain. All users who need access to the NewProjects folder must be able to add, delete, and modify files and folders in the NewProjects folder. Users in the acquired companies also will require access to this folder. You need to create the required Active Directory groups and configure the required permissions for the NewProjects folder. Your solution must minimize ongoing administrative effort as you add new companies to the network. You must also minimize unnecessary traffic across the WAN connections. What should you do?（）

A. Create a single universal security group. Add all users that require access to the folder to the group. Create a domain local group in the testking.com domain. Add the universal group to the domain local group. Assign permissions to the shared folder by using the domain local group.
B. Create a global security group in each domain. Add all users that require access to the folder to the global group in their domain. Create a domain local group in testking.com domain. Add the global groups to the domain local group. Assign permissions to the shared folder by using the domain local group.
Create a universal security group in each domain. Add all users that require access to the folder to the group in their domain. Assign permissions to the shared folder by using the universal groups.
D. Create a global security group in each domain. Add all users that require access to the folder to the group in their domain. Assign permissions to the shared folder by using the global groups.