You work as the exchange administrator at TestKing.com. The TestKing.com network has just been migrated to Exchange Server 2010. You are responsible for managing the Exchange network for TestKing.com. The organization contains two Exchange Server 2010 Edge Transport servers and six Hub Transport servers that are located in two Active Directory sites. The Edge Transport servers receive all e-mail messages that are send to the network. You receive an instruction from TestKing to configure anti-spamfiltering. You should make sure that the anti-spam filtering configurations are applied to the EdgeTransport servers. This should be accomplished with the least amount of adminstrative effort. What should you do？（）

• A、You should consider configuring the setting of the one Edge Transport server manually and export it to the other one.
• B、You should consider configuring EdgeSync synchronization.
• C、You should consider joining both Edge Transport servers to an Active Directory domain.Thereafter a forest trust should be created for the internal forest.
• D、You should consider implementing the Active Directory Federation Services （AD FS）.