An electromagnetic wave is represented by the electric field $\vec{E} = E_0 \hat{n} \sin [\omega t + (6y - 8z)]$. Taking unit vectors in $x, y$ and $z$ directions to be $\hat{i}, \hat{j}$ and $\hat{k}$,the direction of propagation $\hat{s}$ is:

• A
  $\hat{s} = \left( \frac{-3\hat{j} + 4\hat{k}}{5} \right)$
• B
  $\hat{s} = \left( \frac{4\hat{j} - 3\hat{k}}{5} \right)$
• C
  $\hat{s} = \left( \frac{-4\hat{k} + 3\hat{j}}{5} \right)$
• D
  $\hat{s} = \left( \frac{-3\hat{i} - 4\hat{j}}{5} \right)$