— What are you mailing, Tom?

— A textbook ______ a new method of teaching physics. I want my friend to take a look at it.

[      ]

A. is based on

B. based on

C. basing on

D. which based on

某公司网络管理员使用DHCP服务器对公司内部主机的IP地址进行管理。在某DHCP客户机上连续执行“ipconfig/all”和“ipconfig/renew”命令，执行“ipconfig/all”得到的部分信息如图(A)所示，执行“ipconfig/renew”命令时，在客户机捕获的报文及相关分析如图(B)所示。请分析图中的信息，补全空白处内容。