Implementing H-VPLS instead of VPLS reduces which requirement?

Implementing H-VPLS instead of VPLS reduces which requirement?
A . having a full mesh of PWs between all the PE routers in the service provider MPLS core
B . having a full mesh of PWs between all the UPE routers
C . having to implement QinQ tagging between the UPE and the NPE
D . having to implement MPLS LDP between the UPE and the NPE
E . the overhead of using BGP or LDP autodiscovery

View Answer

Answer: A