In a plane electromagnetic wave, the directions of electric field and magnetic field are represented by \hat{k}\: and\: 2 \hat{i}-2\hat{j} respectively. What is the unit vector along direction of propagation of the wave.
Option: 1 \frac{1}{\sqrt{2}}\left ( \hat{j}+\hat{k} \right )
 
Option: 2 \frac{1}{\sqrt{5}}\left ( 2\hat{i}+\hat{j} \right )
Option: 3 \frac{1}{\sqrt{5}}\left ( \hat{i}+2\hat{j} \right )  
Option: 4 \frac{1}{\sqrt{2}}\left ( \hat{i}+\hat{j} \right )

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