多项选择题

A. Use the following XML segment in the Web.config file.<identity impersonate="false"/>
B. Use the following XML segment in the Web.config file.  <identity impersonate="true"/>
C. Use the following code segment to access the file. WindowsPrincipal wp =(WindowsPrincipal)HttpContext,Current.User;WindowsIdentity wt = (WindowsIdentity)wp.Idetity;WindowsImpersonationContext wic = wi.Impersonate();// Access The file herewic.Undo();
D. Use the following code segment to access the file. WindowsIdentity wi = WindowsIdetity.GetCurrent();WindowsImpersonationContext wic = WindowsIdentity.Impersonate(wi.Token);// Access the file herewic.Undo();