Assuming member ASs are fully meshed and use full mesh iBGP, what is the required number of BGP sessions within the confederation?

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A confederated AS is comprised of three members. One member is comprised of 4 routers, while the other two members are comprised of 3 routers each.

Assuming member ASs are fully meshed and use full mesh iBGP, what is the required number of BGP sessions within the confederation?
A . 12
B . 13
C . 14
D . 15

Answer: D