SanDisk m250 Sansa - question -does it supports MPEG-4 AAC files

I have bought several songs on iTunes.  I am so confused, I have never done any of this before.  They say that your mp3 player has to support MPEG-4 AAC files.  Does anyone know if this model supports these files?

Is anyone familiar with iTunes and knows how to put songs on this Sansa model?