Options:
a. listService.UseDefaultCredentials = true;
listService.Credentials = new System.Net.NetworkCredential("user", "pass", "domain");
b. listservice.Credentials = true;
listService.Credentials = new System.Net.NetworkCredential("user", "pass", "domain");
c. listService.DefaultCredentials = true;
listService.Credentials = new System.Net.NetworkCredential("user", "pass", "domain");
d. None of these
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