You are the administrator of a Windows 2000 network. You purchase 25 new portable computers that have a preinstalled version of Windows 98. You upgrade the 25 new computers to Windows 2000 Professional. You want to remove the Logoff option from the start menu on the 25 new computers. Which two methods can you use to accomplish this goal？（）

A. On the advanced tab of the task bar and start menu dialog box, clear the Display log off option.
B. On the advanced tab of the task bar and start menu dialog box, clear the administrative tools option.
C. On the general tab of the task bar and start menu dialog box, clear the personalized menus option. Log off and then log on to the computers.
D. Use a local computer policy that will not include the logoff option on the start menu.
E. Use the user profiles tab within the properties of my computer to change the profile from the local profile to a roaming user profile.&e