Which of the following can be used to provide scalable WAN connectivity that supports a very large number of remote sites (over 500 sites)?

Which of the following can be used to provide scalable WAN connectivity that supports a very large number of remote sites (over 500 sites)?
A . Layer 3 MPLS VPN
B . VPLS
C . VPWS
D . Point-to-point GRE tunnels

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Answer: A