如图所示是管理员在网络中捕获到的三个数据包。Source destination protocol info
/10.0.12.110.0.12.2 TCP 50190>telnet [ SYN ] seq =0 win =8192 Len =0 mss =1460
/10.0.12.210.0.12.1 TCP telnet>50190[ SYN,ACK ] seq =0 Ack =1 win =8192 Len =0 mss =1460
/10.0.12.110.0.12.2 TCP 50190>telnet [ ACK ] seq =1 Ack =1 win =8192 Len =0
下面说法不正确的是?( )【单选题】