$A$ spherical snowball is forming such that its volume is increasing at the rate of $8 \text{ cm}^3/\text{sec}$. Find the rate of increase of its radius when the radius is $2 \text{ cm}$.
- A$\pi \text{ cm/sec}$
- B$\frac{1}{8\pi} \text{ cm/sec}$
- C$2\pi \text{ cm/sec}$
- D$\frac{1}{2\pi} \text{ cm/sec}$
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