iPhone 12 mini headphone adapter

Hi, everyone. I just ordered a iPhone 12 mini and wanted to be prepared with a headphone adapter as I listen to audiobooks daily with a stereo with an auxiliary cable. I went to Walmart and saw they had a UBC-C to Headphone Jack, and the worker said that would be what I need. However, when I got it home, and looked at the picture of the iPhone 12 mini's power cord, it seems more like I would have needed the Lightning Cord to Headphone adapter. Before I exchange it, does anyone know which one I would need? Thanks so much!