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Let $A=(3,2,1)$ be a vertex of a parallelogram, and let $B=(-1,0,4)$ and $D=(2,3,0)$ be the two neighboring vertices of the parallelogram.

What is the area of this parallelogram?

$2$

$\sqrt{2}/2$

$\sqrt{2}$

$1$

$\sqrt{2}/3$