B (Layer 3 MPLS VPN hub and spoke):A hub-and-spoke MPLS VPN allows scalable branch-to-data-center communication with efficient routing, simplified management, and adequate support for real-time video across 200 branches.
Other options explained:
A: DMVPN is flexible but not as scalable or deterministic for 200-site enterprise video conferencing.
C: VPLS operates at Layer 2 and may introduce unnecessary broadcast domain scaling challenges.
D: Full mesh MPLS is difficult to manage for such a large number of sites.
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