Naruto headband color

On the very popular show called naruto ninjas seem to have different colored headbands on the show,this one reason has to do nothing with their grades,ability,age,ect.
The color of their band has only to do with on one of two things at the ninja academy,for those of you why dont know
all ninja have to first go to the ninja academy to graduate and gain their headband and perform missions to clients.
the ninja academy had souly to with how to use ninja tools,chakra control,understanding and applying ninja hand signs, and having sharp instincts.
There are only three things that could possible apply to what color a ninjas headband would be
1.the classroom they graduated in
2.how long it took them to graduate judged by ninja skill
3.how long they have been a ninja(also knows a shinobi)
 
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