What statement about Transit AS is true?

What statement about Transit AS is true?

A.
Traffic and prefixes originating from Source AS are carried across a Transit AS to reach their destination AS.

B.
Traffic and prefixes originating from Transit AS are carried across a Stub AS to their destination AS.

C.
Traffic and prefixes originating from Transit AS are carried across a Stub AS to their Source AS.

D.
None of the above.