单选题What is the purpose of an address book？（）AIt holds security policies for particular hosts.BIt holds statistics about traffic to and from particular hosts.CIt defines hosts in a zone so they can be referenced by policies.DIt maps hostnames to IP addresses to serve as a backup to DNS resolution.
单选题
What is the purpose of an address book？（）
A
It holds security policies for particular hosts.
B
It holds statistics about traffic to and from particular hosts.
C
It defines hosts in a zone so they can be referenced by policies.
D
It maps hostnames to IP addresses to serve as a backup to DNS resolution.
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