You are the administrator of a Windows 2000 network. The network is configured as shown in the exhibit.  Computers on the Sales subnet run Windows 2000 Professional. These computers are dynamically assigned IP addressing and configuration information from a DHCP server on the subnet. Computers on the development subnet run Windows 98. These computers are statically assigned IP addressing and configuration information.  Users on the Sales subnet report that they cannot communicate with users on the development subnet. A user who works on computer3 reports that he cannot communicate with computers on either subnet. You want all users to be able to communicate with other users on both subnets. What should you do?（）

• A、Change the frame type to 802.2 on computer3.
• B、Change the default gateway option IP address on the DHCP server.
• C、Change the default protocol on the computers on the Sales subnet to NWLink IPX/SPX/NetBIOS Compatible Transport Protocol.
• D、Enable TCP/IP protocol with the default settings on Computer3.
• E、Add the NetBEUI protocol to the binding order on all client computers.