单选题Users are unable to access the Internet but the users are able to send/receive email from theirdesktops. Which of the following ports is MOST likely being blocked?（）A25B80C110D143
单选题
Users are unable to access the Internet but the users are able to send/receive email from theirdesktops. Which of the following ports is MOST likely being blocked?（）
A
25
B
80
C
110
D
143
参考解析
解析：
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