A 4 cm cube is cut into 1 cm cubes. The total surface area of all the small cubes is :

Answer: Option D

Number of small cube formed :
$$\begin{array}{rl}& =\left(\frac{4\times 4\times 4}{1\times 1\times 1}\right)\\ & =64\end{array}$$
Total surface area of the small cubes :
$$\begin{array}{rl}& =\left[64\times \left(6\times 1^2\right)\right]\text{c}{\text{m}}^2\\ & =384\text{ c}{\text{m}}^2\end{array}$$