$x+i y=\sqrt{\frac{p+i q}{r+i s}}$ হলে, $\left(x^{2}+y^{2}\right)^{2}=$ কত?

$\frac{p^{2}-q^{2}}{r^{2}+s^{2}}$

$\frac{p^{2}+q^{2}}{r^{2}-s^{2}}$

$\frac{\mathrm{p}^{2}+\mathrm{q}^{2}}{\mathrm{r}^{2}+\mathrm{s}^{2}}$

$\frac{p^{2}-q^{2}}{r^{2}-s^{2}}$