You are the administrator of a Windows 2000 network. The network is configured as shown in the Network Diagram.  Client computers on the Sales subnet run Windows 98 and use DHCP. Client computers on theDevelopment subnet run Windows 2000 Professional and use statically assigned TCP/IP settings.Users on the Sales subnet report that they cannot communicate with users on the Development subnet. Auser who works on ComputerES3 reports that he cannot communicate with computers on the development subnet.You want all users to be able to communicate with other users on both subnets.What should you do? （）(Each correct answer presents part of the solution.)

• A、Enable the NetBEUI protocol on all computers on both subnets
• B、Enable the TCP/IP protocol with the default settings on ComputerES3
• C、Change the subnet mask on all computers to 255.255.255.0
• D、Change the default gateway DHCP scope option to 192.168.0.80
• E、Change the default gateway on the computers on the Development subnet to 192.168.0.80.