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以下关于VPN的说法正确的是（ ）。
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以下关于VPN的说法正确的是（ ）。

A VPN指的是用户自己租用线路，和公共网络物理上完全隔离的、安全的线路
B VPN指的是用户通过公用网络建立的临时的、安全的链接
C VPN不能做到信息认证和身份认证
D VPN只能提供身份认证，不能提供加密数据的功能

正确答案
B
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