97 Deville CD Changer Harness

[mhinchley]

Here is a pic of two harnesses off of the rear passengerside wheel well. Which of these is the CD changer harness, if either? I have the am/fm tape player (non Bose), with the SOURCE button. Wanting to make sure it is pre wired for CD so I can add a Ipod adapter. Plugs are label A and B for identifying purposes. I am thinking it is plug B, but want to make sure it is one of them before ordering.

http://pg.photos.yahoo.com/ph/southbend_stud1972/album?.dir=/f156&.view=t