What is the advantage of BGP confederation compared to BGP route reflector implementation?

What is the advantage of BGP confederation compared to BGP route reflector implementation?
A . Confederation provides better redundancy. Route reflector clients can peer to only one cluster
B . Confederation allows use of template session and template policy. Route reflector can use only peer-group
C . The IBGP policies can differ internally within and between the sub-autonomous systems
D . Confederation is more scalable. Route reflector implementation still requires confederation to eliminate completely the full mesh requirement

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Answer: C