For an extended object, how many equations do you typically need to fully express the condition of equilibrium?

$($note: not every problem will ultimately require this number of equations in order to solve it$,$ but to fully express that an extended object is in equilibrium, this number of equations are needed$)$

$2($Fx $=0,$Fy $=0)$

$3($Fx $=0,$Fy $=0,$ $=0)$

$4($Fx $=0,$Fy $=0,$ $=0,$mass $=0)$