What does the Poynting vector represent in electromagnetic theory, and how is its direction determined?

Correct option is C

​$$\text{In electromagnetic theory, the Poynting vector } \vec{S} \text{ represents the rate of electromagnetic energy flow per unit area (power density).} \\[8pt]\text{It is defined as:} \\[6pt]\vec{S} = \vec{E} \times \vec{H} \\[10pt]\textbf{Direction:} \\[6pt]\bullet \ \text{Given by the right-hand rule of the cross product} \\[4pt]\bullet \ \text{Perpendicular to both the electric field } \vec{E} \text{ and magnetic field } \vec{H} \\[4pt]\bullet \ \text{Indicates the direction of energy propagation}$$​​