DNS服务器中提供了多种资源记录，其中定义区域授权域名服务器的是（ ）。
- A.SOA
- B.NS
- C.PTR
- D.MX
正确答案及解析
正确答案
B
解析
SOA记录：SOA说明能解析这个区域的DNS服务器中哪个是主服务器。
NS记录：用于标识区域的DNS服务器，有几台提供服务。
MX记录：邮件交换记录。
PTR记录：IP地址到DNS名称的映射，用于反向解析。
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