The radius of a cylinder is increasing at the rate of $3 \, m/sec$ and its altitude is decreasing at the rate of $4 \, m/sec$. The rate of change of volume when the radius is $4 \, m$ and the altitude is $6 \, m$ is:
- A$80\pi \, m^3/sec$
- B$144\pi \, m^3/sec$
- C$80 \, m^3/sec$
- D$64 \, m^3/sec$
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