Which two restrictions must the Enterprise Campus network designer consider when evaluating WAN connectivity options? (Choose two.)

A.
OSPF over a multiaccess EMS or VPLS network may not have consistent broadcast or multicast performance

B.
IP multicast is not supported over Layer 3 MPLS VPN; instead a Layer 2 MPLS VPN must be utilized with service provider support

C.
QoS requirements with MPLS-VPNs must be implemented by the service provider

D.
Hierarchical VPLS designs are the least scalable

E.
IGMP snooping is not an option with VPLS or EMS; instead administrative scoping or allowing sufficient bandwidth for unnecessary multicast traffic at the edge links is required

Explanation: