You are the administrator of your company’s network. The dial-up server on your network is configured to support certificate authentication.   A user named Tom wants to use smart card authentication on his Windows 2000 Professional portable computer. You that Tom’s computer has a PC Card smart card reader and the appropriate drivers installed. You give Tom a smart card to use.   What else should you do to enable smart card authentication on Tom’s computer? （）

• A、Configure a dial-up connection to use EAP.  Select the smart card device for authentication. 
• B、Configure a dial-up connection to use SPAP.  Select the smart card device for authentication.
• C、Configure a dial-up connection to use certificate authentication.  Enable the usercredentials for authentication.
• D、Configure a dial-up connection to connect to a private network through the Internet.  Enable L2TP be create a virtual private network （VPN） tunnel.