Which two statements about a transit AS are correct? (Choose two.)
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 or 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.