What is the purpose of a BGP confederation?

What is the purpose of a BGP confederation?
A . It limits the number of routes a device receives from its peers, which reduces CPU load.
B . It improves service by increasing the number of simultaneous iBGP peering sessions.
C . It redirects traffic away from route reflectors, which reduces their operating load.
D . It reduces the number of iBGP peers and increases stability.

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Answer: D