Plot the following points on graph paper and connect them in the order given. Then connect points $A$ and $D$.  

$A(–3, 4),$ $B(1, 6),$ $C(5, –2),$ and $D(1, –4)$

If $ABCD$ is rotated $90º$ clockwise $(\circlearrowright)$ about the origin to form $A^\prime B^\prime C^\prime D^\prime$, what are the coordinates of the vertices of $A^\prime B^\prime C^\prime D^\prime$?