A customer is using a service provider to provide a WAN backbone for a 30-site network. In establishing the network, the customer must work within these constraints: - The customer has a self-managed MPLS backbone. - The VPLS WAN backbone of the service provider does not support PIM snooping. - Multicast VPN must be used for multicast support inside some VRFs. What can the customer do so that multicast traffic is NOT flooded to all sites? 

Answer options:

A. Configure static GRE tunnels and run the MPLS and multicast VPN inside these GRE tunnels.
B. Use Label Switched Multicast for the multicast transport.
C. Use PIM-SSM as the multicast routing protocol with IETF Rosen Draft multicast VPN.
D. Configure a static mapping between multicast addresses and MAC addresses.
E. Use GET VPN to encrypt the multicast packets inside the WAN.

A