our network consists of an internal network and a perimeter network. On the internal network there is a server named Server1. On the perimeter network there is a server named Server2. All servers run Windows Server 2003 Service Pack 2 (SP2).You schedule a task to transfers files from Server1 to Server2 by using FTP.You monitor the network traffic from Server1 to Server2 and notice that the user name and password used for the FTP transfer are sent as plain text.  You need to ensure that all FTP traffic between Server1 and Server2 is encrypted.  What should you do?（）

• A、Implement IPSec. 
• B、Install a server certificate on Server1. 
• C、Install a server certificate on Server2. 
• D、Use the Encrypting File System on Server1.