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● 在（23）中，①代表的技术通过对网络数据的和加密传输，在公网上传输私有数据、达到私有网络的安全级别；②代表的技术把所有传输的数据进行加密，可以代替telnet，可以为ftp提供一个安全的 “通道”；③代表的协议让持有证书的Internet浏览器软件和 WWW 服务器之间构造安全通道传输数据，该协议运行在 TCP/IP 层之上，应用层之下。 （23）
A.
①SSH②VPN③SSL
B.
①VPN②SSH③SSL
C.
①VPN②SSL③SSH
D.
①SSL②VPN③SSH
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