题目内容
（请给出正确答案）
[单选题]
Virtual Private Networks（VPN) are networks deployed on a （) network infrastructure.A
A.public
B.private
C.local area
D.wide area
提问人：网友yanweiwei55
发布时间：2022-01-06
如搜索结果不匹配，请 
A、class MenuItem { private: virtual void Click() =0; public: Command* command; };
B、class MenuItem { public: virtual void Click() = 0; private: Command* command; };
C、class MenuItem { private: virtual void Click() = 0; void undo(); public: Command* command; };
D、class menuitem { public: virtual void Click() = 0; private: Command* command; };
