单选题A host is expected to be a mail relay or receiving endpoint. Which of the following daemons should be listening for connections on port 25？（）A ftpdB imapdC pop3dD sendmail
题目
单选题
A host is expected to be a mail relay or receiving endpoint. Which of the following daemons should be listening for connections on port 25？（）
A
ftpd
B
imapd
C
pop3d
D
sendmail