You need to design a strategy for remote client computer access that meets all business and technical requirements. What should you do？（）

• A、Configure the HTTP virtual server on the Exchange front-end server to require a secure connection. Instruct the sales personnel to use Microsoft Outlook Web Access to connect to the Exchange front-end server
• B、Configure the back-end Exchange servers to use static ports for RPC connections. Open the required ports on the firewall. Install Microsoft Outlook 2003 on the portable computers and configure it to connect to the Exchange back-end server using a MAPI connection
• C、Configure the Exchange front-end server to require secure connections from IMAP4 client computers. Install Microsoft Outlook 2003 on the portable computers and configure it to use a secure IMAP4 connection
• D、Configure the Exchange servers to support RPC over HTTPS. Install Microsoft outlook 2003 on the portable computers and configure it to use RPC over HTTPS