which one of the following extends a private network across public networks ?

which one of the following extends a private network across public networks ? Correct Answer Virtual private network

A virtual private network (VPN) is a network that is constructed using public wires — usually the internet — to connect remote users or regional offices to a company's private, internal network. 
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Which one of the following extends a private network across public networks?
Which one of the following extends a private network across public network?
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