What is the proper way to ensure that updates to the /etc/aliases file are seen by sendmail？（）

单项选择题Whatistheproperwaytorefreshsendmail？（）

A.sendmail -bt
B.sendmail -ba
C.refresh -s sendmail
D.startsrc -s sendmail

单项选择题AclientcannotmountafilesystemfromanNFSserver.Whichofthefollowingoptionsisthemostprobablecauseforthemountfailure？（）

A.Server is not running  rpc.lockd
B.Client is not running the rpc.statd
C.Filesystem not exported by the server
D.Client nfsd daemons are all inoperative

单项选择题Onasystemwidebasis，whichofthefollowingproceduresisbesttomakeNISnameresolutiontakeprecedenceoverDNS？（）

A.Remove the /etc/resolv.conf file
B.Unset the NSORDER environment variable
C.Add the following line to /etc/netsvc.conf： hosts=nis，bind，local
D.In a NIS and DNS environment， NIS takes precedence so there is nothing to change

单项选择题WhichofthefollowingfilesshouldbeeditedtoenableSNMP？（）

A./etc/rc.nfs
B./etc/rc.tcpip
C./etc/rc.net
D./etc/inetd.conf

单项选择题WhichofthefollowingNISdaemonsmustrunonanAIXNISclientmachine？（）

A.ypbind
B.ypserv
C.ypwhich
D.yppasswdd