For which reason do you deploy BGP confederations within a BGP transit backbone?

For which reason do you deploy BGP confederations within a BGP transit backbone?
A . to support a larger number of eBGP peer sessions
B . to increase the number of routes that can be redistributed between the running IGP and BGP
C . to reduce the number of eBGP routes that must be shared between autonomous systems
D . to reduce the number of iBGP peering sessions

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Answer: D