You configure your Windows 2000 Professional computer for Internet Connection Sharing and for TCP/IP filtering as shown in the exhibit.
You test your TCP/IP filtering configuration from another client computer. You can access web sites, but you cannot access FTP sites.
What should you do to be able to access FTP sites?
A．Add Port 21 to the TCP Ports section.
B．Add Port 138 to the TCP Ports section.
C．Add Port 21 to the IP Ports section.
D．Add Port 138 to the IP Ports section.
