What type of diffs do the my99/00 wrxs have??

front open, LSD viscous coupling, what is the rear... viscous limited... suretrak... open...?

if say 4 wheels have no traction on this model will it just spin 1 wheel on each axle or will 2 wheels at the rear spin and 1 at the front ?

can't find much information for the ADM my99/00 wrx.