【单选题】
A $cat/etc/redhat release
red hat enterprise linux server release 7.1(maipo)
B vim/etc/yum.repos.d/rhel-dvd.repob/aseurl=http://本地主机IP/yumsource
C /ios/rhel - server - 7.1- x86_64 dvd.iso var/www/html/yumsource iso99460 ro ,relatiom
D /ios/rhel - server - 7.1 - x86_64 dvd.iso/yum/mount:/de /loop0 is write -protect,mounting real - only
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