Examine the topology shown above. Within Transit AS 51001, CK3 is setup as a route reflector for CK1 and CK2 , and CK4 is setup as a route reflector for CK5 and CK6 . In this case, how many IBGP sessions are required with the Transit AS 51001? Exhibit:

A.
4

B.
5

C.
10

D.
15

E.
30

F.
36