In BGP, why should a Route Reflector be used?

A.
To overcome issues of split-horizon within BGP

B.
To reduce the number of External BGP peers by allowing updates to ‘reflect’ without the need to be fully meshed

C.
To allow the router to ‘reflect’ updates from one Internal BGP speaker to another without the need to be fully meshed

D.
To divide Autonomous Systems into mini-Autonomous Systems, allowing the reduction in the number of peers

E.
None of the above