单项选择题
A user is browsing to a newly created internal site called www.comptia.org. After putting incredentials the page comes up blank. Which of the following is MOST likely the cause?（）
A. The user must add the new site to the local log file.
B. A proxy exception has not been configured.
C. SMTP has not been configured.
D. The loopback address has not been configured.
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