Find the Area of the Shaded Region $96 \mathrm{~m}^{2}$ B) $256 \mathrm{~m}^{2}$

Find the area of the shaded region.
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A) $96 \mathrm{~m}^{2}$
B) $256 \mathrm{~m}^{2}$
C) $320 \mathrm{~m}^{2}$
D) $192 \mathrm{~m}^{2}$