下列关于端到端加密说法不正确的是( )。

A．传输过程中，每个结点将收到的密文先解密再加密然后传出

B．数据加密在会话的各端是由进程来处理的，加密时报文仍为明文形式

C．它对防止线路“串扰”等搭线窃听，以及防止网络软件泄露等情况非常有效

D．端对端加密方式属于表示层功能

I _____ to the party _____ at all possible, but I was fully occupied last night. [ ]

A. should have gone; were it

B. could go; if it had been

C. would go; it had been

D. could have gone; had it been