如果在一台主机的Windows环境下执行Ping命令得到下列信息 Pinging www.nankai.edu.cn [202.113.16.33] with 32 bytes of data: Reply from 202.113.16.33: bytes=32 time<1ms TTL=128 Reply from 202.113.16.33: bytes=32 time<1ms TTL=128 Reply from 202.113.16.33: bytes=32 time<1ms TTL=128 Reply from 202.113.16.33: bytes=32 time<1ms TTL=128 Ping statistics for 202.113.16.33: Packets: Sent = 4, Received = 4, Lost = 0 (0％loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms,Average = 0ms 那么下列结论中无法确定的是 A）为www.nankai.edu.cn提供名字解析的服务器工作正常 B）本机使用的DNS服务器工作正常 C）主机www.nankai.edu.cn上WWW服务工作正常 D）主机www.nankai.edu.cn的网关配置正确