Company a Has Grown Nationwide in the U

Company A has grown nationwide in the U.S., and each new remote branch has a Metro Ethernet circuit provisioned back to the data center at the headquarters on the West Coast. The operations team says that it cannot manage hundreds of circuits as the company continues to grow. You review the topology and notice that many of the branches are close to each other in geographical zones. How can you redesign this network to improve manageability and increase scalability?

A) Add an aggregation layer router in each geographical zone.
B) Add a redundant data center on the East Coast to serve some of the traffic there.
C) Add a default route in each branch toward the data center on the West Coast.
D) Use Optimized Edge Routing at the data center.
E) Build an overlay MPLS network with Layer 3 VPN.