Which three methods can be used to reduce the full-mesh IBGP requirement in a service provider core network? (Choose three.)
A. Implement route reflectors
B. Enable multi-protocol BGP sessions between all the PE routers
C. Implement confederations
D. Implement MPLS (LDP) in the core network on all the PE and P routers
E. Enable BGP synchronization
F. Disable the IBGP split-horizon rule
