Choose the correct answer in the distance between the two planes: $2x + 3y + 4z = 4$ and $4x + 6y + 8z = 12$ is

Question

$$\begin{array} ((A)\, 2\; units \quad& (B)\, 4\; units \quad& (C)\, 8\; units \quad& (D) \, \frac{2} { \sqrt{29}} \; units \end{array}$$