If $\overrightarrow{E}$ and $\overrightarrow{B}$ represent electric and magnetic field vectors of an electromagnetic wave,the direction of propagation of the electromagnetic wave is along . . . . . . .
- A$\vec{B}$
- B$\vec{E}$
- C$\vec{B} \times \vec{E}$
- D$\vec{E} \times \vec{B}$
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