Start of repeated scenarioYou are an enterprise desktop support technician for Fabrikam, Inc. Active Directory InformationThe company has a main office and a branch office. The main office hosts all of the companys servers. The main office connects to the branch office by using a WAN link. The network contains a single Active Directory domain that has 500 users. The domain contains three domain controllers and an enterprise root certification authority (CA). All servers run Windows Server 2008 R2. All user accounts are in an organizational unit (OU) named Employees. The computer accounts for all desktop computers are in an OU named Desktops. The computer accounts for all portable computers are in an OU named Laptops. A startup script is deployed to all computers by using Group Policy objects (GPOs). Client ConfigurationsAll client computers run Windows 7 Enterprise. All users have desktop computers. All computers are members of the domain. All desktop computers use wired connections to connect to the network. All portable computers use wireless connections to connect to the network. The wireless network is secured by using EAP-TLS. Company policy states that all client computers must be configured by using DHCP. The company has an internal Web site. The Web site is configured to use SSL encryption and to require client certificates. All company users can access the internal Web site. End of repeated scenario The help desk reports that all newly installed desktop computers cannot access the companys file server. The help desk sends you the screen capture shown in the exhibit. (Click the Exhibit button.) You need to resolve the network connectivity issue. The solution must adhere to the company policy. What should you instruct help desk to do?（）

• A、Modify the network configuration and define the IPv4 default gateway.
• B、Modify Windows Firewall and enable File and Printer Sharing in the public profile.
• C、Modify Windows Firewall and enable File and Printer Sharing in the domain profile.
• D、Modify the network configuration to automatically obtain an IP address and a DNS server address.