A Microsoft Exchange mobile messaging solution uses Microsoft Windows Mobile 5.0 with  Microsoft Messaging and Security Feature Pack. You deploy the solution by using front-end and back-end servers. Microsoft Exchange Server 2003 Service Pack 2 is installed on the front-end server.   You need to use the remote wipe feature.   What should you do？（）

• A、Install Microsoft Windows Server 2003 Service Pack 2 on all domain controllers. 
• B、Install Microsoft Exchange Server 2003 Service Pack 2 on the back-end server. 
• C、Install Microsoft Exchange Server ActiveSync Web Administration Tool on the front-end server.
• D、Install Microsoft Exchange Server ActiveSync Web Administration Tool on the back-end server.Reset Instructions Calculator.