____________ David says sounds right to Helen. That’s why she has made up her mind not to leave him _____________ happens.

A．Whatever; whatever

B．No matter how; whatever

C．No matter what; however

D．Whatever; no matter how

TCP/IP是Internet采用的协议标准，它是一个协议系列，由多个不同层次的协议共同组成。（）是属于网络层的低层协议，主要用途是完成网络地址向物理地址的转换。

A．RARP

B．ARP

C．IGMP

D．ICMP