2011 550 x2 fluid change

Hello,
I am trying to change all fluids on the above said bike, is there a transfer case I need to drain or is it drained via the transmission?, also what is angle drive fluid? is it the rear diff?
Under front drive on the below website it says

Demand
Drive Plus
2877922 qt
"front drive fluid"
9.3 oz
(275ml)
1.7 oz (50ml)
before
bleeding of
ADC

Annually*
ADC Fluid
every 2 Years

What is ADC? and how do you bleed it?
http://www.purepolarisoil.com/pdf/Ma…e_ATV_2011.pdf