Maybe I am not understanding your question, ask in a different way please.

(BGP) Consider the following network: AS 65432 AS 2 AS 1 AS 3 AS 6 AS1, AS2, and AS3 are ISPs, peering with each other at the links between routers J-K, N-A, and D-G AS6 is a customer of AS1 and AS3. Two more customer networks are shown All routers are shown. All links between routers are shown. All networks are running OSPF as their IGP, and all link costs are equal All providers are running I-BGP The prefix for AS6 is 12.2.0.0/16. The prefix for AS65432 is 135.207.16.0/20. The prefix for the nameless customer containing router S and host d is 192.20.225.0/24 AS1, AS2, and AS3 number their routers out of 1.0.0.0/8, 2.0.0.0/8, and 3.0.0.0/8, respectively DO not make any unnecessary assumption. If you have to make any assumptions they have to be reasonable and state them very clearly How would AS6 tell the world that it prefers receiving traffic for the upper half of its address space only via the C-Y link, unless of course it is broken