Which option is an advanced WAN services design consideration for a multipoint architecture that connects two or more customer devices using Ethernet bridging
techniques over an MPLS network?

A.
VPLS

B.
Metro Ethernet

C.
MPLS

D.
SONET/SDH

Explanation:
Virtual Private LAN Services (VPLS) is a class of VPN that supports the connection of multiple sites in a single bridged domain over a managed IP/MPLS network.
VPLS presents an Ethernet interface to customers, simplifying the LAN/WAN boundary for Service Providers and customers, and enabling rapid and flexible service
provisioning, because the service bandwidth is not tied to the physical interface. All services in a VPLS appear to be on the same LAN, regardless of location.
VPLS uses edge routers that can learn, bridge and replicate on a VPN basis. These routers are connected by a full mesh of tunnels, enabling any-to-any
connectivity.
Virtual Private LAN Service (VPLS) is a way to provide Ethernet-based multipoint to multipoint communication over IP or MPLS networks. It allows geographically
dispersed sites to share an Ethernet broadcast domain by connecting sites through pseudowires.
http://www.cisco.com/c/en/us/products/ios-nx-os-software/virtual-private-lan-services-vpls/index.html