What $is$ the area $of$ the parallelogram whose edges are the lines

$y=-\frac{1}{2}x-1,y=x+2,y=-\frac{1}{2}x+2,$ and $y=x-\frac{5}{2}$

Select one:

$a.9$

$b.\frac{33}{2}$

$c.3$

$d.2$