某公司的内部网络如图2-1所示，管理员在DNS服务器上安装了Linux系统，并完成配置DNS服务器。公司申请到IP地址是200.100.1.2/30.【问题2】图2-2为在DNS服务器上使用nslookup进行测试的相关结果，命令"server192.168.10.2"的作用是（5），由该图可以得出下列选项说法错误的是（）。备选答案：A.域名www.ruankao.com能被正常解析为192.168.10.80B.该域名服务器的PTR不正常C.域名正常的测试
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