If $\vec{E}$ and $\vec{B}$ are the electric and magnetic field vectors of an electromagnetic wave,then the direction of propagation of the electromagnetic wave is
- Aalong the direction of $\vec{E}$
- Balong the direction of $\vec{B}$
- Cparallel to the direction of $\vec{E} \times \vec{B}$
- Dperpendicular to the direction of $\vec{E} \times \vec{B}$
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