From a cube of side 6 cm, a hemisphere of maximum volume is scooped out. What is the remaining volume?

A

$$216 - 12\pi$$

B

$$\left[27 - \left(\frac{2\pi}{3}\right) \times 6 \right]$$

C

$$216 - 18\pi$$

D

$$36 - \left(\frac{3\pi}{3}\right)$$