If the side of an equilateral triangle increases at the rate of $\sqrt{3} \text{ cm/sec}$, then the rate of change of its area when the side is $12 \text{ cm}$ is
- A$18 \text{ cm}^2/\text{sec}$
- B$10 \text{ cm}^2/\text{sec}$
- C$12 \text{ cm}^2/\text{sec}$
- D$3\sqrt{3} \text{ cm}^2/\text{sec}$
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