— Could you please pass me the book?

A．Yes, I could

B．No, I couldn't

C．Sure. Here you are

D．No, that's no problem

UE进行业务的后，通过哪条消息我们能判断出手机，是属于cs域还是ps域（）

A.RRC连接建立请求

B.初始化直传

C.RRC连接建立完成

D.RAB指派