Drop a normal from a point and reflect through its foot

A plane passes through $(1,-2,1)$ and $(2,-1,-1)$ and is parallel to the line $\mathbf r=(1,-1,0)+s(3,1,-2)$, $s\in\mathbb R$.

(i) Find the foot of the perpendicular from $A(1,1,-1)$ to the plane.

(ii) Hence or otherwise find the shortest distance from A to the plane.

(iii) Find the image of A reflected in the plane.