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A plane wave is incident normally on a perfect conductor as shown in figure. Here $E_{x}^{r}=\mathrm{H}^{\prime}$, and $\overrightarrow{\mathrm{P}}$ are electric field, magnetic field and Poynting vector respectively, for the incident wave. The reflected wave should be

1. $\mathrm{E}_{\mathrm{xr}}=-\mathrm{E}_{\mathrm{s}}$ '
2. $\mathrm{H}_{\mathrm{y}}=-\mathrm{H}_{\mathrm{v}}$
3. $\overrightarrow{\mathrm{P}}=-\overrightarrow{\mathrm{P}}$
4. $\mathrm{E}_{x}^{r}=\mathrm{E}_{x}$