Which challenges do companies face when implementing an overlay Virtual Private Network (VPN)? (Select two.)
A. The number of logical links required limits the scalability of the solution.
B. Companies must work closely with service providers to implement these VPNs.
C. The IT staff spends too much time configuring network protocols and encryption options.
D. Overlay VPN solutions are costly as compared to peer-to-peer VPNs.
E. Overlay VPNs have not been standardized, so companies must purchase proprietary solutions.
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