$A$ farmer owns a triangular plot in Guntur. He measures the lengths of the sides of his property as $4 \text{ cm}$,$5 \text{ cm}$,and $7 \text{ cm}$. Then the area of land of the farmer in $\text{sq. cm}$ is
- A$2 \sqrt{6}$
- B$4 \sqrt{6}$
- C$\sqrt{6}$
- D$8 \sqrt{6}$
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