单项选择题
A.MTA(Mail Transfer Agent) B.MDA(Mail Delivery Agent) C.MMA(Mail Man Agent) D.MUA(Mail User Agent)
A.srm.conf B.access.conf C.mimE.conf D.httpD.conf
A./etc/ftpaccess B./etc/hosts.deny C./etc/ftpusers D./etc/pam.d/ftp