You work as the Exchange administrator at Company.com.The Company.com network contains an Exchange Server 2010 Organization.Company.com has its headquarters in Stockholm where you are located.The Company.com network contains a hub transport serer named -ex02.-ex02 is used to receive all incoming email messages from the internet.you decide to install anti-spam agents on -ex02.during the day you receive an instruction from management to make sure that only e-mail messages sent to the e-mail addresses in the active directory is accepted by -ex02. What should you do？（）

• A、This can be accomplished by having the properties of the default Receive Connector modified.
• B、This can be accomplished by having the properties of the Sender Filtering agent modified.
• C、This can be accomplished by having the properties of the Recipient Filtering agent modified.
• D、This can be accomplished by having the properties of the default Accepted Domain modified.