单选题A user states that email is not being received. Which of the following protocols should thetechnician check for incoming mail?（）ASMTPBPOP3CNNTPDHTTP
单选题
A user states that email is not being received. Which of the following protocols should thetechnician check for incoming mail?（）
A
SMTP
B
POP3
C
NNTP
D
HTTP
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解析：
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