Which three methods can be used to reduce the full-mesh IBGP requirement in a service provider core network? (Choose three.)

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

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Answer: A,C,D