You are the administrator of a small server based network. While installing Windows 2000 Professional on your computer, you configure the network adapter card for each computer to use TCP/IP and assign static IP setting information. During installation the setup detects and installs the 10/100 MBPS UTP only network adepter card on computers 6 & 8 and 10 MBPS/UTP combination adapter card on the other 7 computers. You accept the default settings for the network adapter card and finish installing the network adapter card. All computers are connected to 10/100 switch that has category 5 UTP cabling. After installation you find that computer 6 and 8 can communicate with each other. You want all 9 computers on your network to be able to communicate with each other.   What should you do?（）

• A、Configure the 10/100 switch to transfer only at the 100 MBPS rate.
• B、Configure 10/100 MBPS network adapter card to switch all the computers at 10 MBPS rate.
• C、Change the combination network adapter card to use the BNC transceiver setting.
• D、Change the combination network adapter card to use the UTP transceiver setting.