You are the desktop administrator for your company. The company's network consists of a single Active Directory domain. All client computers are Windows XP Professional computers that have manually configured IP addresses. A new user named Marc reports that he cannot connect to the network. All other users can connect to the network. You run IPconfig.exe on Marc's computer, and you receive the following response. Windows IP Configuration. Ethernet adapter Local Area Connection: You want to ensure that Marc can connect to the network. What should you do?（）