Which three statements about a transit AS are correct?

Which three statements about a transit AS are correct? (Choose three)
A. A transit AS has eBGP connection(s) to only one external AS.
B. Routes between ASs are always exchanged via Ebgp.
C. A transit AS uses an IGP like OSPF of ISIS to propagate the external networks within the transit AS.
D. Core routers within a transit AS normally use default routing to reach the external networks.
E. iBGP sessions can be established between non directly connected routers.
F. Edge routers within a transit AS usually announce themselves as the next hop in the iBGP updates.

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