I can't believe I'm going to ask the dumbest question ever.....but...I don't want to burn up my radio!

Why are there sooooo many different power cords for the radio?


Which one should I use? I have the Starmate 4 and am using the car dock.

Here are the options:
http://www.tss-radio.com/sirius-acce...c-231_295.html

Thanks again!