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In the figure above, line $l$ passes through the point $\left( 0,0 \right)$ and the two points indicated in the graph. What is the value of the product $ab$, where $a$ and $b$ are constants?

A

$-\cfrac { 1 }{ 2 }$

B

$\cfrac { 1 }{ 2 }$

C

$-2$

D

$2$

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