which path protocol and registered port number help to transport the CDRs from the CDFs to the CGF over the Ga reference point?

In the offline charging architecture, which path protocol and registered port number help to
transport the CDRs from the CDFs to the CGF over the Ga reference point?

A.
UDP src.port and dest.port as 2123

B.
UDP src.port random and dest.port as 3386

C.
TCP src.port and dest.port as 3386

D.
UDP src.port random and dest.port as 2123