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$18.$ The points $()3,0,(),0,$x $2$

$1$

$,,$x x

$$

$$ and $2$

$1$

$3,$ x

$$

$$

$$

$$ are the vertices of a rectangle, where $3$x $>=,$ as shown in the

figure above. For what value of x does the rectangle have a maximum area?

$($A$)3$

$($B$)4$

$($C$)6$

$($D$)9$

$($E$)$ There is no such value of x$.$