One of the ABC Company routers is unable to form a neighbor relationship with an external
BGP peer. Which two statements are true about external BGP neighbor relationships?
(Select two)

A.
EBGP neighbors use TCP port 179 to exchange BGP routing tables.

B.
The BGP split-horizon rule specifies that routes learned via IBGP are never propagated to
other EBGP peers.

C.
EBGP neighbors must be in different autonomous systems.

D.
Static routes or an interior gateway protocol is required between EBGP neighbors.

E.
When an EBGP neighbor receives an update from another EBGP neighbor, it should not
forward the update to other EBGP neighbors.

F.
Loopback addresses should be used between EBGP neighbors.