A small hole of area of cross-section $$2 mm^2$$ is present near the bottom of fully filled open tank of height 2m. Taking $$g = 10 m/s^2$$, the rate of flow of water through the open hole would be nearly :

A

$$8.9 \times 10^{-6} m^3/s$$

B

$$2.23 \times 10^{-6} m^3/s$$

C

$$6.4 \times 10^{-6} m^3/s$$

D

$$12.6 \times 10^{-6} m^3/s$$