Which three of these could be reasons?

You configured two routers for EBGP, but you see your BGP neighbor’s state is Active after issuing the show ip bgp neighbor command. Which three of these could be reasons? (Choose three.)

A.
The EBGP neighbor is two hops away, but the neighbor ttl-security command was not configured.

B.
The EBGP neighbor is two hops away, but the neighbor ebgp-multihop command was not configured.

C.
The EBGP neighbor is two hops away, but the neighbor disable connected-check command was not configured.

D.
One router is configured for version 4, but the other router is configured for version 6.

E.
The EBGP neighbor password is incorrect.