How are inbound and outbound call legs handled from the perspective of the source router?

How are inbound and outbound call legs handled from the perspective of the source router?

A.
Only the inbound call leg is established by the source router.

B.
Only the outbound call leg is established by the source router.

C.
The inbound call leg andoutbouondcall leg are matched to the same dial peer.

D.
The outbound call leg is matched first. Then, once the source is known, an inbound call leg is established.

E.
The inbound call leg is matched first. Then, once the destination is known, an outbound call leg is established.