How does BGP set-up an internal BGP peering session?

A.
BGP requires an IGP to discover a route to the internal BGP speaker and then uses
E-BGP to establish a peering session.

B.
BGP requires an EGP to discover a route to the internal BGP speaker and then uses
I-BGP to establish a peering session.

C.
BGP uses I-BGP to discover a route to the internal BGP speaker and then establishes a
peering session.

D.
BGP requires an IGP to discover a route to the internal BGP speaker and then is able to
establish an I-BGP peering session.