If water is being poured at the rate of $36 \text{ } m^3/sec$ into a cylindrical vessel with a base radius of $3 \text{ } m$,then the rate at which the water level is rising is:
- A$\frac{4}{\pi} \text{ } m/sec$
- B$4\pi \text{ } m/sec$
- C$\frac{\pi}{4} \text{ } m/sec$
- D$\frac{3}{\pi} \text{ } m/sec$
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