When run on a machine called client， which of the following commands would mount the /usr/local/bin directory from the host machine over the /home/bin directory on client？（）

单项选择题InaDNSenvironment，thezonefilethatmapshostnamestoIPaddress（sometimescalledthenamed.hostsfile），iscreatedonwhichofthefollowingservers？（）

A.Cache
B.Primary
C.Secondary
D.Primary and secondary

单项选择题WhatisthefirststepinsettingupaPrimaryDomainNameServer？（）

A.Create the cache file
B.Create the IP zone file
C.Create the named.boot file
D.Create the name zone file